Sonic the Hedgehog

Sonic is a free spirited hedgehog who possesses the ability to travel at the speed of sound, fighting evil on a regular basis and never turning his back on those in need of help. Assuming the role of leadership throughout the “Dimension” saga, particularly during the Hunt for the Chaos Emeralds, Sonic keeps the pace going during the group’s missions, and does everything in his power to put a stop to the threats they face.

PURSUIT THROUGH LEAF FOREST
Sonic first appears confronting his main foe, Doctor Eggman, alongside his friends, Tails and Knuckles. As the Doctor stages an attack on Leaf Forest, claiming to have the seven chaos emeralds, Sonic vows to end his scheme and get the emeralds back—and then performs a Spin Dash, curling into a ball and demolishing the Egg Hammer Tank. Afterward, Sonic gives chase to the Doctor as he attempts to escape in his Eggmobile.

While in the air, Tails carries Sonic by the wrists, but after being hit by one of the many projectiles thrown by the Doctor, Sonic is forced to fall and land on Knuckles’ back instead. Eventually both are knocked back down to the ground by a fired capsule, and Sonic takes the opportunity of being back on solid ground to dash forward and attack the Eggmobile himself, several times. Sonic also uses his Spin Dash ability to jump upward and catch Tails and Knuckles from falling later on, allowing the three of them to attack the Eggmobile together, further diminishing its flying capabilities. The trio is finally forced to abandon pursuit when a massive explosion occurs on the ground, leaving behind a wreckage of scrap metal and spare parts amidst the flames, with the Doctor nowhere in sight.  

===INITIAL CROSSOVERS ===

Shortly after the disappearance of Doctor Eggman, strange arrivals suddenly begin appearing out of nowhere, one group at a time; Sonic initially believes them to be reinforcements sent by the Doctor, but after further observing their behavior, he realizes that these characters seem just as perplexed about this as he is. Upon asking them all where they came from, and learning of Calvin and Hobbes’ arrival by time machine, Sonic jumps to the conclusion that the new arrivals have all come from different time periods. ====FIGHT WITH FUTURE ALLIES ==== The chaos emeralds are later discovered by GIR, prompting Sonic to explain to everyone else that they are precious stones that grant unlimited energy; in doing this, however, he accidentally causes all of the newcomers to begin quarreling over who should be allowed to keep them. When Knuckles proposes that they all engage in physical combat for possession of the emeralds, Sonic and Tails protest, but everyone else agrees; at this point, battle becomes unavoidable.

As the contest begins, Sonic finds himself being chased by Tad and Yoshi. When Treeby lands on Yoshi’s back, Sonic jumps overhead and kicks Treeby off, only to be blasted backward by Zim’s Irken handgun. Sonic later faces off against Tank, blocking the robot frog’s rapid whirling attacks and then jumping upward and kicking Tank to the ground. Immediately afterward, Hobbes (with Calvin riding on his back) rams into Sonic, but retreats when Calvin sees Tails coming; Sonic then joins Tails’ pursuit of the boy and his tiger.

When he and Tails catch up with Calvin and Hobbes in the air, Sonic devises an attack plan. Just as Sonic launches forward, Hobbes throws himself backward, and the two of them attack each other at the same time; Sonic manages to block Hobbes’ assault and throws a kick of his own, but gets punched by the tiger and then Calvin. He and Tails then land back on the ground below, where Knuckles is struggling against the six frogs, and they both help out their ally in fighting them off.

Only after this does Sonic remember the chaos emeralds, which were left behind, and he, Tails, and Knuckles return to where they were found. Shadow the Hedgehog appears and reveals that he has them, and then criticizes everyone for pointlessly fighting amongst themselves when Doctor Eggman is still on the loose—bringing Sonic and the rest to their senses and effectively putting an end to the heroes’ battle.

ATTACK ON MOBIUS

 * "Everyone! This enemy right here wants the chaos emeralds for himself! The only way we can stop him is if we work together! Who's with me?!" -Sonic, to the new arrivals

Doctor Eggman suddenly returns to the scene, intent on resuming his assault on the land; this causes Sonic to call everyone else to order and bring to their attention the Doctor’s evil plans. As all of the newcomers express their surprise at the sight of this common enemy, Sonic rallies them together and encourages them all to join forces so they can stop the Doctor—and in doing so, Sonic ultimately sees to the creation of a newfound alliance.

As another chase commences, Sonic is carried into the air once again by Tails, where he kicks away some of the fired missiles directed at their squadron, protecting his new teammates. When Luigi is struck by an electricity bolt and falls toward the ground, Sonic jumps down after him to make sure he is okay, only to get hit himself, by a projectile fired from the Egg Walker. Sonic quickly recovers, however, and manages to catch up and lead the way on solid ground as the chase persists. Later on, both the Egg Walker and the Doctor's escape capsule are overpowered, and the chase momentarily ends; but Sonic is shocked by the sudden arrival of a colossal robot resembling Doctor Eggman, who then attempts to flee via jetpack. As Zim and GIR resume pursuit, Sonic tells Shadow to help the two out, assuring him that he and the others can handle the robot.

Defeating the robot proves to be easier said than done, however, as Sonic tries to attack its massive exterior using his Spin Dash ability and ultimately gets blasted into the air. He is quickly rescued by Hobbes, both of them realizing that the robot’s destruction will require more than simple obvious attacks; upon noticing Knuckles, Mario, Luigi, Yoshi, and Tad atop the robot’s head, apparently planning a strategy, Sonic and Hobbes then decide that the obvious attacks could perhaps serve better as a deliberate distraction.

Sonic formulates a plan with Calvin to use his spaceship to distract the robot, when suddenly Amy Rose enters, causing Sonic to initially express weariness over her usual infatuated behavior toward him. Nevertheless, he allows both Amy and Cream to help them fight the robot, as he himself rides inside the spaceship, which Calvin pilots. Later the robot starts rampaging through Leaf Forest, and Sonic and Calvin work on firing lasers constantly in an effort to keep it at bay—but this proves to be of no use, as the robot refuses to stop. In the end, however, the giant robot is finally destroyed, and Sonic manages to rescue Knuckles from the midair explosion of its head. He then declares triumphantly that, with the robot’s destruction, the new alliance has achieved its first victory.

HUNT FOR THE CHAOS EMERALDS
Sonic taunts Doctor Eggman in his state of defeat, only to become astonished when the seven chaos emeralds abruptly appear out of thin air, and then vanish, evidently by the Doctor’s doing. After the Doctor escapes and Calvin’s spaceship shows the group exactly where the emeralds were transported, Sonic decides that they should venture first to the city in Zim’s time period (dimension), in order to catch up with Doctor Eggman and reacquire the first two chaos emeralds.

CHASE THROUGH THE CITY SEWERS
When everyone arrives at Zim’s base, Sonic takes half the group with him to track down Doctor Eggman in the city sewers—his task force including Tails, Amy, Mario, Zim, GIR, Tad, Tank, and Wart. They search below ground for an extensive period of time before the Doctor finally enters of his own accord, prompting Sonic and the rest to quickly run after him as he flies another Eggmobile down a dark tunnel.

As Mario acquires a Hammer Suit and hides in his new shell, Sonic speeds into his ball form and rams Mario toward the Doctor, causing the two to collide. Sonic runs alongside his teammates as they work on putting the Eggmobile out of commission, until at last, it powers down and is destroyed. Sonic then boards the Doctor’s Egg Sub and attempts to prevent him from getting away; he uses his Spin Dash ability to smash into the Egg Sub, slowing it down so everyone else can attack also. When the Egg Sub finally deteriorates and explodes, the Doctor is once again nowhere to be seen, so Sonic tells everyone to spread out and keep searching.

Later, Sonic hears further commotion from a distant passageway and realizes that the Doctor has been spotted. He catches up with the rest of the team and sees them pursuing the rolling Egg Wheel, with Doctor Eggman inside. Amy whacks Sonic forward using her hammer, and Sonic collides with the Egg Wheel, throwing it off course; he then chases the Doctor through various tunnels, until finally luring him toward a large pit and kicking him downward, causing the Egg Wheel to fall and crash below, emitting a large blast that tears up a city intersection. Sonic sees the hole it created, leading to the surface, and deduces that the Doctor must have fled into the city itself.



CITY ESCAPE
Sonic assembles his task force above ground, and they attempt to search for Doctor Eggman’s whereabouts yet again. Some time afterward, Sonic hears Zim talking and yelling at someone from an alleyway, and he also hears the Doctor’s voice as he slowly approaches; when he finally arrives at the scene, he sees Zim being attacked by Egg Robos, and teams up with Tails, Mario, and Wart to fight off the Egg Robos and save Zim. Sonic does this by kicking away two and decapitating a third using Spin Dash.

Sonic later pauses when he sees a young boy come to the Doctor’s defense and kick Zim away, declaring that he would rather help Doctor Eggman than let Zim continue his mission. At this point Sonic realizes that Zim never did specify what his mission was, and asks him what the boy is talking about; Zim responds by saying that he is simply talking about their mission to collect the chaos emeralds. Sonic watches as the boy questions the Doctor, figures out that the Doctor had deceived him somehow, and finally, the boy attacks him. As Sonic observes this, he does not notice that an Egg Robo is about to shoot him from behind, until Amy suddenly jumps in and destroys the Egg Robo with her hammer, saving Sonic’s life.

Sonic and his task force meet up with the rest of the team, who have just returned from the Skool. He learns that Shadow stayed behind to retrieve the second chaos emerald from a boiler room that is about to detonate from gas pressure, and fears that Shadow may not make it out in time. In the end, however, Shadow arrives unharmed, having stopped the boiler room explosion and holding both of the chaos emeralds they came for. Sonic applauds his safe return, and escapes with the others as Shadow uses Chaos Control to transport them all back to Leaf Forest.

BRAWL AT BOULDER CANYON
Sonic learns from Calvin that the next two chaos emeralds, those residing in Frogger’s time period (dimension), have been moved, one of them now residing in Boulder Canyon. He also shows interest in the “legend” Frogger tells everyone about upon arriving there, and places his trust in Frogger’s knowledge of the area to help them find the emerald and escape the canyon with haste.
 * "Surrender Frogger to you? Yeah, I'll do that when I grow another nose! Sorry, pal!" -Sonic, to Swampy the crocodile

The group at large is later taken aback by the sudden arrival of a crocodile that is holding Tad and Cheese in its claws; Sonic guesses that this must be Swampy, Frogger’s enemy, and refuses point-blank to meet his demands of surrendering Frogger over to him. A battle ensues, with Sonic assisting everyone else for a short while in their attempts to subdue Swampy, particularly when his allies are in danger. He later decides that everyone else will be able to handle the crocodile, and joins Shadow and Tails in searching for the missing chaos emerald. Soon afterward, they find Zim, GIR, and Minimoose lying on the ground in a heap, just before Metal Sonic suddenly enters and attacks Tails, much to the surprise of Sonic and Shadow.

Sonic learns that his robotic counterpart was sent by Doctor Eggman to collect the same chaos emerald, and the two of them engage in combat. As Shadow and Tails also fight Metal Sonic, the real Sonic retaliates in kind when his friends are harmed, though Metal Sonic’s electricity-generation abilities catch him off guard as they are used to blast him off his feet. Later, Tails points out to Sonic that the chaos emerald is sitting atop a shrine just behind them, but as Sonic grabs it, he inadvertently triggers the release of a gigantic boulder that rolls after everyone, causing Sonic to quickly realize that the legend Frogger had described was true. Sonic runs away quickly from the rolling boulder, but reaches a dead end along with everyone else. Only by Frogger’s guidance does Sonic and the rest of the team manage to escape to safety just as the boulder rolls past.

After the group reaches a nearby pyramid, Sonic tells the others all about Metal Sonic, and fears that their task is growing more and more dangerous. He suggests that they hurry, since Doctor Eggman evidently knows where they are.

RESEARCH FACILITY BREAK-IN
When the team ventures to the Research Facility to find the next chaos emerald, they are all ambushed by a multitude of security drones; Sonic and the others are forced to scatter and fight them off. As he is tailed by several drones, Sonic does a wall jump and leaps overhead, causing one of them to crash into the wall, and then he punches and kicks his way through the rest, at one point coming to Tails and Wart’s defense, helping them ward off more drones. The battle ends quickly, with the group once again victorious.

Sonic then explores the vicinity with everyone else, seeking the chaos emerald they came for, but in the end, with no success. After a long while, Calvin, Amy, Knuckles, Tails, and Hobbes are seen arguing, and Sonic initially tries to keep the peace, but as the subject matter becomes personal, he ends up getting drawn into the quarrel himself. They are forced to bring their argument to a halt, however, when Shadow suddenly lets out an angry outburst, ranting about their foolish behavior and deciding to leave the group, having had enough; everyone is shocked, and Sonic tries to get Shadow to come back, but to no avail. Sonic are the others are left dismayed by Shadow’s departure.

CONFRONTATION IN THE SKY
As the group discovers that the chaos emerald they had been seeking was moved to the sky prior to their arrival, Sonic and the rest cram into Zim’s summoned voot cruiser and take off, intending to find the emerald and acquire it quickly. Upon reaching their destination, they find the young boy they saw in Zim’s time period (dimension), holding the chaos emerald. They learn that his name is “Dib," and Sonic tries to convince him that they are not the enemy, and that both he and the group want the same thing. However, Sonic then learns from Dib a startling piece of news: Zim is trying to destroy mankind.
 * "Okay, kid. Hand over the chaos emerald, and no one gets hurt." -Sonic, to Dib

Sonic realizes that Zim just wanted the chaos emeralds so that he could finally complete this mission of his, and consequently, the group becomes angry at Zim; they all attack him for his treachery, and Sonic prepares to kick him off the cloud he is dangling from—but he is caught off guard by Doctor Eggman’s unexpected arrival, and is forced to let Zim escape as the Doctor’s army of Egg Robos emerges and attacks the group. Sonic fights his robotic counterpart Metal Sonic once more, but being still shaken by Shadow’s departure, Zim’s betrayal, and everyone else falling into a state of defeat all around him, he is beaten this time, knocked unconscious and captured along with the rest of the team.

SKIRMISH IN SWAMPY'S LAIR
Sonic later wakes up, discovering that he, Knuckles, Calvin, and Dib have been imprisoned on Doctor Eggman’s Bomber Ship, and assuming that everyone else was placed aboard the two Egg Carriers. Initially, Sonic feels a sense of despair, but Calvin convinces them all that there may still be a way out of this situation.

The group is brought to a Haunted House, where Swampy the crocodile resides; upon being led to his underground lair, Sonic and the rest find out that Swampy is allied with Doctor Eggman, and that the two of them have arranged for the group’s termination. The Doctor taunts Sonic and forces him, along with Knuckles, Calvin, and Dib, to stay and watch the frogs be exterminated first. While the villains are busy, however, Sonic and Calvin put two Egg Robos out of commission and manage to make it look like they simply collapsed, feigning innocence as the Doctor investigates.

Later, the Doctor drops a chaos emerald from his back pocket, and Calvin retrieves the emerald and throws it to Sonic, who jumps in the air and catches it. Pandemonium ensues, and Sonic begins fighting off more Egg Robos, catching another emerald spewed out by Swampy’s contraption while doing so. He then runs forward and kicks the crocodile into his own machine, rescues the frogs, and lays down an explosive set to detonate. As the explosion occurs, the team runs out of the room; Sonic breaks a window while in his ball form, allowing them all to escape the Haunted House, and then leads the way to the Bomber Ship, which they use to take off into the sky, leaving Swampy’s lair behind.

While in the air, however, they are followed by the two Egg Carriers; Sonic stands by and watches firsthand as Calvin quickly maneuvers the ship and fights back against the oncoming vessels, though occasionally being forced to hold on as the Bomber Ship makes sharp turns and descends suddenly. Eventually, all Egg Carriers are defeated, but Doctor Eggman lands on top of their Bomber Ship, prompting Sonic to confront him there. An aggressive recklessness overcomes Sonic at this point, as he threatens the Doctor with death and kicks him over the edge of the ship, sending him plummeting toward the distant ground below. Sonic then appears troubled by his own abrupt change of conduct, and wonders how much more it will be changed by this quest—or by those yet to come.

RAID ON TOAD TOWN
The team travels to their final destination: the Mushroom Kingdom in Mario’s time period (dimension), via the Doctor’s Bomber Ship, in order to acquire the two remaining chaos emeralds. After a night’s recuperation, Sonic and the others prepare to explore the area, when they suddenly come across a very distraught woman, whom Mario and Luigi identify as Princess Peach; Sonic shows sympathy for her as she explains to everyone how she was thrown out of her own castle, and the group assumes that Doctor Eggman must have been the cause. As Sonic nobly steps up to help the princess regain possession of her castle and her kingdom, everyone else follows suit.

However, the team is astonished to find that the invader is none other than their old, traitorous ally, Zim; Sonic and the rest of the team realize that he has obtained the last two chaos emeralds, and they receive even more surprises with the untimely arrival of two avaricious alter-egos known as Wario and Waluigi, as well as a gruesome turtle-like creature—whose name, Sonic correctly guesses, is Bowser. Matters fall into disarray, and battle follows. Since Mario and Luigi are occupied in fighting their alter-egos, Sonic takes it upon himself to protect the princess from harm; in one instance he pushes both Peach and Calvin out of the way of GIR’s artillery fire, and as the fighting enters Toad Town, he leads them to a safe area before joining in. Sonic also saves Dib by kicking Bowser backward and into the ground, halting his pursuit of the boy.

Sonic later instructs Tails to make sure all civilians are evacuated, upon noticing how much more hazardous the situation has become. He witnesses Mario and Luigi’s temporary defeat at the hands of Wario, now in a biker outfit; Sonic suggests that Yoshi throw them the Power Star he has found, and at this point the two plumbers are able to easily overpower Wario. Shortly afterward, Sonic learns from Tails that evacuees are being transported to a kingdom called “Sarasaland,” and advises Peach to join them, very much concerned for her safety. Then, after hearing of an escape route from Dib, who also successfully acquired the last two chaos emeralds from Zim, Sonic flees to the open sea along with the rest of the group; they all manage to quickly create a raft and leave Zim and the Mushroom Kingdom behind as they escape on the water.

THE BATTLE OF DINOSAUR LAND
After a short-lived sigh of relief, the team notices that they are being followed, by Bowser and his Koopaling squad; Sonic gives the order for the group to separate, pulls out a board, and surfs the ocean as a means of fleeing the oncoming enemies. Pursued by Bowser’s Clown Copter, Sonic—along with Mario, Knuckles, and Amy—manages to steer clear of the Mecha-koopas being churned out, along with a Big Steely that rolls across the water, chasing after the four of them. They eventually reach the shores of Dinosaur Land and watch Tails, Cream, and Treeby fight in the air against the Koopalings; when Bowser enters and strikes Cream, causing her to plummet toward the ground with excessive momentum, Sonic dashes forward and catches her.
 * "Somehow I doubt that you'll spare anyone's life if you have the chaos emeralds. You'll never lay your hands on them!" -Sonic, to Metal Sonic

The battle reaches dry land, and Bowser begins attacking everyone; Sonic attempts to assist Knuckles in his counter-offensive, but gets blasted backward, along with Amy and Cream, by a spell fired from the   wand of a Magikoopa named Kamek. The three of them crash into Mario, Luigi, and Yoshi, joined shortly afterward by Knuckles, and then they are all assailed by the seven Koopalings. Sonic first fights alongside Amy against Wendy O. Koopa and Larry Koopa, both suffering blows from the Koopalings but quickly replying in kind afterward; later, he and Yoshi face Larry and Roy Koopa, both of them jumping upward to avoid the Koopalings’ sudden rushing attacks, but being saved the trouble of retaliating by Cream and Knuckles, who enter and promptly punch the opponents away. Eventually, all seven Koopalings are defeated.

Sonic races back to shore just in time to watch Bowser undergo a transformation into the skeletal form of Dry-Bone Bowser; he joins everyone else in running back through the forest as they are all chased by the gaunt figure. Upon witnessing Bowser’s revival abilities—when Amy smashes him to pieces with her hammer and he simply gets back up, fully restored—Sonic tries colliding with him several times using Spin Dash, in an attempt to weaken him somehow, but with no effect. As punishment, Sonic gets thrown into the air, and crashes on the ground several miles away. In the end, it is Mario and Luigi who manage to finally rid Bowser of his dry-bone powers, and Sonic returns to the scene just as Bowser is defeated.

Sonic runs away as Bowser becomes enraged, but while running he crashes into a warp pipe sticking out of the ground, and drops one of the chaos emeralds. He picks it up again, but gets attacked from behind by Kamek and releases the emerald, which lands in Bowser’s grasp; Sonic watches in horror as the Koopa King absorbs its energy, and pursues Bowser with a determination to reclaim the emerald, only to get pummeled aside along with everyone else. After collaborating with Dib, Tails, and Mario, Sonic thwarts Bowser by dodging his quick attacks and countering with a kick when he is caught off balance; the strategy works, and everyone else, in the long run, manages to prevail over Bowser’s enhanced capabilities by doing the same. Finally, Sonic watches as Luigi abruptly becomes gigantic in size and Bowser is kicked away so effortlessly.

Sonic runs to the crash site, but is shocked to find Metal Sonic there, holding the chaos emerald Bowser had been using; he dashes forward to fight his robotic counterpart, but gets hit by an enormous blast that decimates the cliff and sends him plunging into the water below. Both the constant assault from Metal Sonic and his inability to swim causes Sonic to sink deeper and deeper underwater, and eventually he loses consciousness. Sonic later wakes up above the surface once more, realizing that Knuckles rescued him; afterward, they both see Frogger engaging Metal Sonic in combat, and rush forward to help, Sonic riding on Knuckles’ back as the battle is taken to the middle of the sea. Suddenly, a huge rock carving of Bowser’s head somehow begins rising to the surface from underwater, and Sonic presumes that this must be the entrance to the Valley of Bowser. He and Knuckles jump atop the gateway and meet Metal Sonic there.

Sonic dodges a heat beam fired by Metal Sonic, but while attempting to retaliate, he and Knuckles get punched and land in the water once again, this time within the interior of a sunken ship. While underwater, Sonic is tossed backward by Metal Sonic’s energy blasts, but is saved again by Knuckles before he can drift too far. As Sonic reemerges, he sees Metal Sonic now fighting everyone else. During the battle, Sonic is repeatedly thrown into the ocean, but he eventually manages to catch up with Metal Sonic by running atop the water itself, dodging laser blasts and kicking the robot into the air; however, he is caught by surprise when Metal Sonic creates a powerful waterspout that hurls him away. As the waterspout rages across the sea, Sonic notices the Valley of Bowser gateway submerging, and hears from Knuckles that Metal Sonic had gone inside. Everyone quickly runs through the cave entrance just before it collapses.

CLASH AT THE VALLEY OF BOWSER
The group ventures through the Valley of Bowser, searching for Metal Sonic; they learn from Hobbes that another robot was involved in the earlier battle, and after hearing the physical details—large, red and white, with numbers on its exterior—Sonic determines that the robot must have been Chaos Gamma, having encountered him before (in "Sonic Battle"). The biggest shock, however, arrives with the sudden appearance of Doctor Eggman and an entire army of robots and villainous allies from the alternate time periods (dimensions), including Swampy the crocodile, Bowser and his Koopa squad, the Wario Bros., Metal Sonic, Gemerl the android, Chaos Gamma with the rest of the recreated E-Series robots, and a vast militia of Egg Robos. Nevertheless, Sonic remains defiant, stating that nothing will make the group hand over the chaos emeralds, and soon afterward, both teams begin brawling.
 * "FOR MOBIUS!!!" -Sonic leading his allies into battle

Sonic moves rapidly, kicking Larry Koopa away and dodging Chaos Delta’s laser fire while coming to his friends’ aid, but gets punched immediately afterward by Waluigi. He also hurries to assist Treeby in fighting off Roy and Wendy O. before battling Metal Sonic once more. Sonic and Mario later cause Metal Sonic and Bowser to crash into each other by jumping upward during their combined attacks; they switch opponents then, Sonic now facing off against Bowser, who blows the hedgehog backward using his fire breath, during an attempted Spin Dash.

Sonic later receives assistance from Tails in fending off the Koopa King, but they are all shortly distracted by Mario’s severe harm, caused by a tremendous blast from Metal Sonic, which brings the battle to a halt. Sonic realizes that Mario is in serious condition, and that the Doctor’s new army has the group overwhelmed. However, he valiantly stands beside Mario’s unconscious form, as does everyone else, and they all prepare for the worst—But suddenly, Sonic and the rest find themselves transported away from the Valley of Bowser, and away from Doctor Eggman’s army.

STAR-MOON HOMEWORLD INVASION
The group finds themselves on an unrecognizable space vessel, now standing in the company of two extraterrestrial life forms, whom Calvin identifies as Galaxoid and Nebular; Sonic is taken aback when he hears that in the eyes of these two aliens Calvin is the Supreme Earthling Potentate, and is even more surprised to discover that Calvin had given them the Earth during their first meeting. After being convinced that Galaxoid and Nebular are not hostile, and learning that their home planet has been invaded, Sonic agrees with Cream that the group should help them, since they saved the group from Doctor Eggman. While traveling, Sonic also learns from the two aliens that he and everyone else in the team are actually from alternate dimensions; this causes Sonic to express incredulity over the fact that, for so long, they were all convinced that they were from different time periods.

Upon arriving on the home planet of the Star-Moon Alliance, the team is shocked to hear that the invaders are none other than the Irken Empire—which Sonic remembers to be Zim’s race. Shortly afterward, SIR units suddenly arrive and begin attacking the group, at which time Sonic leaps forward and kicks one of them away, protecting Galaxoid and Nebular; he also rushes to Calvin’s defense, by speeding into a ball and ramming into a second SIR unit, before punching it further backward. As Hobbes gives the order for everyone to follow him and the aliens to their main base, Sonic runs alongside them, dodging a laser blast and destroying two SIR units from above. Later, Sonic performs a Spin Dash and collides with the formation of SIRs blocking Hobbes’ path, sending them flying in all directions. He then aids the rest of the group in fending off the robots, at one point running atop a mountainside to aid Knuckles and Yoshi, and then providing Cream with assistance as she is chased by yet another squadron.

Eventually, the struggle is brought to a halt as a massive Irken flagship appears and beams the entire group aboard. They are all brought before the Almighty Tallest, and Sonic takes this opportunity to ask them why they sent Zim to conquer Earth; however, he learns that Zim’s mission is actually fake, and that they were only attempting to get rid of him, not even intending for him to find a planet. Sonic is also startled to hear of the Tallest’s intentions for conquering the Star-Moon homeworld (to obtain snacks), and proposes that they instead help the heroes defeat Doctor Eggman and his empire back on Earth—with the promise of donuts as a reward.

THE WAR ABOVE EARTH
Sonic and the rest of the group remain aboard Galaxoid and Nebular’s ship as the Irken Armada and Star-Moon fleet venture to Earth to defeat the Eggman Empire, but Sonic sees that the Doctor’s gigantic battle station, the Death Egg, is operational once more, and becomes horrified at the lengths he has gone to in his efforts to control the planet. Nevertheless, he watches as the Irkens and the Star-Moon Alliance almost easily wipe out the Doctor’s fleet (Bowser’s vessels and doomships included). As the battle carries on, Sonic sees that the Doctor has also installed the Final Egg Blaster on his station, and recalls its terrible potential (“Sonic Battle”); in the end, however, Galaxoid and Nebular’s energy shield manages to protect the entire fleet, and the Irkens’ main flagship then destroys the Final Egg Blaster, allowing Sonic to cheer along with everyone else.
 * "Eggman, what have you done?" -Sonic, incredulous, upon seeing Doctor Eggman's fleet and battle station orbiting the planet Earth

Sonic and the rest of the team then enter the Death Egg itself, and they later find Metal Sonic with two chaos emeralds—one of which, Sonic realizes, he must have stolen from them using Chaos Control. As the group rushes forward to attack Metal Sonic, he uses his newfound power to effortlessly toss everyone aside one by one. Sonic soon loses the five other chaos emeralds when Metal Sonic forces them to scatter, and he tries his hardest to keep his robot double from pursuing them, but gets knocked out of the way each time; he is eventually forced to watch in horror as Metal Sonic transforms into Mecha Sonic, and then Super Mecha Sonic after he retrieves the last of the chaos emeralds. At this point, Sonic, along with everyone else, is utterly defeated.

Even as Super Mecha Sonic declares that he is going to kill him, Sonic still remains defiant, managing to just barely hold himself up. All of a sudden, however, GIR jumps in and kicks Super Mecha Sonic backward, and Sonic is shocked to see Zim and Minimoose enter, also; he attempts to warn them that Super Mecha Sonic is too powerful, but then discovers that they have the Master Emerald with them. Sonic observes as GIR absorbs its power, causes his own super transformation, and begins rapidly pummeling Super Mecha Sonic, all seven chaos emeralds eventually being forced out of him, causing him to turn back into Metal Sonic once more. The real Sonic then gets back on his feet and confronts his robotic counterpart, taunting him before allowing GIR to finally destroy him; afterward, he thanks Zim, GIR, and Minimoose for returning and helping the team.

Sonic and the rest confront Doctor Eggman in the Death Egg’s control room, but they are all suddenly caught unawares by the abrupt arrival of the E-Series robots and several hostages—Cream’s mother and Princess Peach among them. Sonic demands that the Doctor let them go, but soon realizes that the status quo has changed, and that he and the group have no choice but to hand over all of the emeralds, or else watch the hostages die; he walks forward and gives them to the Doctor, but is taken aback by the timely arrival of Shadow, who takes the emeralds, kicks the Doctor across the room, and quickly puts the E-Series robots out of commission, save for E-123 Omega, revealed to be a double agent. The hostages are freed, but the Doctor slips out of sight, and as Swampy, Bowser, and the E-Series robots reemerge and begin attacking everyone, Sonic goes to search for Doctor Eggman.

After reentering the room housing the station’s central core, Sonic is forced to dodge countless rockets, projectiles, and laser blasts fired directly at him by the Doctor, who is nowhere to be seen. He later finds two armed missiles and throws them toward the central core, and runs out of the room just before it explodes. Sonic returns to the control room in time to see that the Death Egg is now falling toward Earth; as everyone panics, Sonic suggests that Shadow use Chaos Control to get them all out of the station, but is startled to see Shadow and the apparently reprogrammed E-Series robots begin to exit the room, leaving everyone behind. Sonic faces Shadow and pleads with him, asking that he do the group one last favor, and then reminds him of his promise to Maria, stating that leaving everyone on the Death Egg as it crashes into the planet would go against that promise.

Sonic has Shadow convinced, and everyone is transported to the planet’s surface, where the station can now be seen falling toward them. Everyone watches in fear, until Shadow suddenly absorbs all seven chaos emeralds and the Master Emerald, and takes all of the E-Series robots with him up into the sky, much to Sonic’s surprise; he reminds Shadow of what happened on Space Colony ARK (“Sonic Adventure 2”), but Shadow assures him that it will not happen this time. Sonic watches as they stop the falling Death Egg, push it back out into space, and then use Chaos Control to send the station far away from Earth. Afterward, he sees the chaos emeralds and Master Emerald fall back down to the planet surface, and realizes that Shadow and the E-Series were warped away, as well.

For a while, Sonic broods over their disappearance, but becomes convinced that Shadow is not dead, taking into account his undying determination and willpower; he tells this to Knuckles, and declares that Shadow will one day return, to continue bringing hope to humanity. Later, Sonic joins everyone else in celebration back in Leaf Forest, and marvels at their success in defeating Doctor Eggman and saving the alternate dimensions.

PRELIMINARY XEVIAN ATTACKS
Five years later, Sonic and his friends are seen relaxing on a beach, with little to do now that the Doctor is imprisoned in another dimension; they find themselves missing their old allies, who all went home following the War Above Earth. Suddenly, Zim’s voot cruiser is spotted, and Sonic eagerly runs to where it has landed, only to find GIR and Minimoose, who claim that their master has been captured. Sonic and the rest learn about an old enemy of his named Tak (at which point Sonic recalls Dib referring to his own vessel as “Tak’s ship”), and how she is leading an invasion of the entire planet. While wondering why she would bother to capture Zim if—according to GIR—she supposedly wasn’t interested in revenge, Sonic nevertheless decides that they must come to his aid, and later they all venture to Doctor Eggman’s old hideout so that they may find a vessel which can take them to Zim’s dimension. Upon finding one remaining Egg Carrier, Sonic and Cream discover that another one is still in use, which Sonic deems peculiar.

ATTACK AT THE SWOLLEN EYEBALL NETWORK
Upon arriving in Zim’s dimension, Sonic and his allies find a city in ruins, buildings destroyed and some civilians dead. Shortly afterward, they receive a transmission from Bill the paranormal investigator, who urges them to come to the Swollen Eyeball Network for information regarding the invaders; once there, Sonic in particular greets Dib and Bill enthusiastically, before they all meet the Swollen Eyeball agents, including their leader named “Agent Darkbootie.”

After showing the agents some video footage GIR managed to obtain while captured—displaying that Tak did indeed have some vengeful aims in mind for Zim, hence her return to Earth—the group at large learns from Darkbootie that the invaders originally came from Earth, under the authority of a supercomputer called “GAMP;” in addition, they are told that the invaders themselves are actually clones of GAMP, generated in humanoid form, all of whom rebelled against the humans many years ago and migrated to the planet Xevious just before the Ice Age. Evidently, now is the time for them to reestablish their rule on Earth—which Tak is now helping them accomplish—and upon hearing this, Sonic decides that they must find out what she has done with Zim so that they all may figure out how to defeat this race. However, before they can leave, Tak herself enters the premises, with her own personal SIR unit and an entire squadron of Gamp clones/Xevians right behind her.

Sonic attempts to learn from her the whereabouts of Zim, while also telling her that they know all about her and her new allies; however, she responds by saying that Sonic does not even know the half of what he and his friends are now up against, following which the Xevians begin their attack on the group. Sonic finds himself having difficulty fighting just one of them, as they are quick in dodging his melee attacks; additionally, as they begin firing laser blasts from their own arms, he is forced to jump and dodge them as best he can. In one instance, however, Sonic successfully kicks away a Xevian that is attempting to shoot Amy, and continues this streak by fighting more of them off while standing back-to-back with her. For a long while the two of them punch and kick away the oncoming Xevians, until Knuckles relieves them both by ramming into them all at once.

Later, Sonic speeds into his ball form and allows Knuckles to throw him toward another group of Xevians, all of whom are sent flying as he makes contact; but after saving Tails from yet another Xevian, Sonic realizes that there are simply too many, but declares that they must keep fighting anyway. However, when a fire alarm is suddenly activated and overhead sprinklers begin drenching everyone, the Xevians retreat, confusing Sonic and the others. They run outside, only to find a multitude of Xevians waiting for them, along with a gigantic mothership hovering above them all; as towers suddenly start emerging from under the ground and battle resumes, Sonic realizes that they much flee the scene quickly before there is nowhere left to run. Agent Darkbootie urges them to use Dib’s wristwatch, which can transport them wherever they need to go, and Sonic takes the opportunity to grab Dib’s arm and activate the watch, causing a bright light to appear and send the alliance away from the area.

THE REEMERGENCE OF GEMERL
The group is transported to the Mushroom Kingdom, Sonic claiming that it was the first place he thought of, and that they will most certainly need the help of Mario, Luigi, and the rest of their inter-dimensional allies to defeat the Xevians anyway. They all venture to Princess Peach's castle to ask of the Mario Brothers' whereabouts, but she informs them that they are in Dinosaur Land, investigating the destruction of the Valley of Bowser, which they believed to be the work of Doctor Eggman. Sonic & company then receive startling news from Dib: the Doctor is apparently dead, having been killed by the Xevians during the City Invasion — a revelation which heavily impacts Sonic, as he realizes that his arch-enemy is now gone for good.

Sonic decides that he and the group must find Mario, Luigi, & Yoshi, and he promises the princess that he will ensure their safety. They all board Peach's airplane and promptly head for Dinosaur Land, coming across a stranded Luigi out in the open water as they approach their destination. After landing and exiting the plane, and hearing from Luigi that Mario and Yoshi are in trouble, the group receives a shock when both Mario and Yoshi suddenly fly in and crash into the airplane, knocked unconscious; Sonic then turns around and sees Gemerl the android, fully operational even though Sonic remembers seeing him blown to pieces by Galaxoid and Nebular during the War Above Earth. Gemerl engages the hedgehog in combat, Sonic being forced to hastily dodge the android's seemingly enhanced attacks, as well as provide counter-offensive while trying to run away at the same time; the two of them take their brawl to a nearby hilltop, where Sonic attempts several aerial kicks and Spin Dash attacks, all of which Gemerl is able to deflect before throwing a kick of his own, which sends Sonic flying into the air. By the time he lands back on solid ground, Amy has come to his defense, along with Knuckles, Dib, and Bill. Sonic then watches intently as Cream tries to talk to Gemerl, but then becomes horrified as the android suddenly blows her away using an electricity blast from his gem.

Furious, Sonic and his allies get back on their feet and continue fighting Gemerl; he and Knuckles try combining their attack patterns and Spin Dash methods to defeat the android, but they both end up being blasted away after a short while. This time Sonic has trouble recovering, but eventually he manages to come to Dib's aid by kicking Gemerl backward, and then quickly dodging laser fire long enough for Amy to run forward and whack the android away using her hammer. As Luigi enters the battle and manages to hold his own against Gemerl, Sonic readies himself to provide backup if necessary, and later succeeds in pushing Luigi out of the way of another energy blast. While Gemerl lies temporarily subdued atop a mountain some time afterward, Sonic finally demands to know how Gemerl survived and how he has suddenly become so powerful; in response, Gemerl shows Sonic that he possesses the seven chaos emeralds—much to the hedgehog's astonishment—before jumping upward and slicing the entire mountain in half, as Sonic, Knuckles, and Luigi just barely dodge the attack.

Sonic further confronts Gemerl as he threatens Cream and GIR, by ramming into the android in ball form just before another blast is fired from the gem, destroying another mountain; two more blasts are fired at Sonic, who dodges them both before shooting an accusation at Gemerl: that he was the one responsible for the Valley of Bowser's destruction. Gemerl confirms this, while also showing Sonic footage of his reactivation, courtesy of Kamek the Magikoopa. After seeing this, Sonic angrily rushes forward to attack the android, but Gemerl throws Sonic against a wall and holds him up by the neck, preparing to destroy him; however, Sonic manages to break free and regain his advantage, before Gemerl abruptly vanishes from view, nowhere to be seen. Soon afterward, Sonic spots Gemerl atop another hill, charging a powerful blast from his gem, which is suddenly fired at the entire group. In spite of the blast's magnitude, however, the group finds that they are perfectly alright, having been protected by a large energy shield, thanks to the timely arrival of Zim. Sonic and the rest watch as Zim fights Gemerl on his own, shortly realizing the android's weak spot and firing his Irken handgun directly into it; the gem shatters, and Gemerl falls from midair, hitting the ground and moving no more.

 (editing shall recommence soon)