Chaos Emeralds

The Chaos Emeralds are seven ancient relics from Sonic's dimension that possess great power and mystical abilities; they are able to power machinery, cause super transformation, and warp time and space. During "Dimension Mix-Up," they are the target objects which Doctor Eggman desires (as usual), and what the alliance sets out to collect before he does, knowing full well his evil intentions. They are later used for aid in battle by the alliance in "Dimension Takeover," as the Search for the Sacred Elements takes place.

INITIAL CROSSOVERS
The Doctor claims to have these during his initial attack on Leaf Forest, but all seven are later found by GIR, clustered together on the ground. These are what the new arrivals quarrel over during the Fight with Future Allies, and what Shadow the Hedgehog intends to shield from the Doctor; the emeralds are held onto by Shadow during the Attack on Mobius , but after the giant robot's destruction, from aboard the Doctor's Bomber Ship, Chaos Beta causes the emeralds to be scattered across the alternate dimensions (evidently being forced into doing so by an unknown enemy, so revealed by Shadow later on). The green emerald is retrieved by Shadow at the last second, and thus prevented from being lost; so, Shadow uses the emerald to cause Chaos Control and send himself and the group to Zim's dimension, in order to locate the two that were sent there.

HUNT FOR THE CHAOS EMERALDS
The red chaos emerald is found in the city's Cess Pool, and is reacquired by Shadow shortly afterward. Later, he also obtains the grey chaos emerald at the Skool, inside the Boiler Room (located by Calvin's Emerald Radar, which harnesses the power signature of the green emerald). With three emeralds now in the group's possession, they venture next to Boulder Canyon in Frogger's dimension, where the purple emerald sits atop a shrine, but triggers the release of a gigantic boulder that rolls after everyone as soon as Sonic grabs it; meanwhile, Dib locates a chaos emerald from his house, and he and Agent Darkbootie match their research to determine that the power signature is genuine. Dib then finds the cyan emerald up in the clouds in Frogger's dimension, just before the confrontation between him and the group, who seek the same emerald. However, following the team's capture by Doctor Eggman, the collected emeralds are later used to power Swampy the crocodile's contraption, for the purpose of terminating their enemies; but the red emerald suddenly falls out of the Doctor's back pocket, and is reacquired by Calvin and thrown to Sonic afterward. Dib then causes the rest of the emeralds to be spewed out of Swampy's machine, and they fall back into possession of the alliance.

The last two chaos emeralds, blue and yellow, are found in the Mushroom Kingdom by Zim, during his conquest of the area; he uses them to take over Princess Peach's throne, but later he is forced to defend them as the group arrives, followed by Wario and Waluigi, and then by Bowser. As the Raid on Toad Town commences, Zim eventually loses possession of the emeralds to Dib, who then escapes with everyone else, all seven chaos emeralds finally collected. However, during the Battle of Dinosaur Land, Sonic loses the yellow emerald to Bowser, who uses its power to enhance his abilities against the team, and then the same emerald falls into Metal Sonic's hands. He uses it to cause devastating blasts, survive underwater (presumably), and create a large waterspout later on; finally, Metal Sonic uses the same emerald to severely harm Mario during the Clash at the Valley of Bowser.

Metal Sonic now seeks to collect the rest of the chaos emeralds for himself. He uses Chaos Control to snatch the green emerald from the group during the War Above Earth, and then he quickly obtains the rest from them as he battles them all aboard the Death Egg, slowly changing his exterior form while doing so; with all seven chaos emeralds, he at last becomes Super Mecha Sonic. Shortly afterward, however, GIR uses the Master Emerald to brutally weaken him, and causes the seven emeralds to be released from Metal Sonic's possession. They are later acquired by Shadow in the Death Egg's control room, and he uses them to transform into Super Shadow and put the E-Series out of commission. Lastly, as the Death Egg descends toward Earth, Shadow and the reprogrammed E-Series robots use the seven chaos emeralds, along with the Master Emerald, to push the station back out into space and then send it away via Chaos Control, which sends Shadow and the E-Series away as well. The emeralds then fall back down to the planet's surface, where Sonic and the group are standing.

THE REEMERGENCE OF GEMERL
Some time later, Gemerl, under the influence of GAMP, ventures to the Altar in Sonic's dimension, where the Master Emerald and seven chaos emeralds reside; he grabs only the chaos emeralds, and uses them during his battle against Mario, Luigi, and Yoshi in Dinosaur Land. Here, Gemerl uses the emeralds to greatly increase his fighting capacity and easily overwhelm Mario and his allies, along with Sonic and the rest of the group upon their arrival. Gemerl does not, however, use the emeralds to transform into the orb-shaped machine as he had before (in "Sonic Advance 3"), but simply because GAMP does not know of this capability. Eventually, Gemerl loses possession of the chaos emeralds as he is defeated by Zim, and the emeralds are then acquired by Sonic, who uses them to transform into Super Sonic, attack the oncoming Xevian ships, fight Mr. D, and rescue Frogger, Peach, and Toad.

SEARCH FOR THE SACRED ELEMENTS
Following Dinosaur Land's Downfall, the group decides to hold onto the seven chaos emeralds and use them to their advantage during their quest to find the sacred elements. At the time of the Icecap Brawl, for example, Sonic throws the green emerald to Frogger, who uses it to shoot forward and blow Mr. D away with a powerful double punch; Sonic, Calvin, and Hobbes also use the blue emerald to speed up the "Time Machine 3," as it races downhill and smashes Mr. D into the water. In addition, during the Struggle in Sandopolis, Zim punches Mr. D all the way across the dark underground tomb with surprising strength, and realizes that he has the red chaos emerald with him.

While at the Nazca Lines, attempting to find the secret weapon, Sonic lends Zim and Dib each a chaos emerald, while holding onto one himself, so that they may have better fortune in battling the Xevians; at the same time, Amy holds onto the rest, and subsequently begins devastating Xevian ships left and right, with a much larger hammer than usual. Later on, as the two Destroyers are using the fire and wind elements against the team, Amy attempts to deliver the four emeralds to Sonic, but gets blown backward by a laser while doing so, and the emeralds are instead caught by Yoshi, Tails, Knuckles, and Cream. Finally, as Mr. D attacks everyone with the four sacred elements, Sonic throws the seven chaos emeralds to Frogger, who uses them to cause a super transformation of his own and attack Mr. D; he does this by swiftly dodging and breaking through Mr. D's elemental powers, and then by sending a powerful blast toward his enemy, easily shifting the battle in his favor. In the end, Frogger and Mr. D both lose their trinkets, and the emeralds and elements both fall onto the secret weapon, which absorbs their power and activates, creating a significantly large barrier that encases both the Nazca Lines and the entire planet, and then instantly wiping out all remaining Xevian vessels in the area.

THE POCKET DIMENSION CRUSADE
For the next few months, the chaos emeralds remained powering the secret weapon along with the four sacred elements, keeping the barrier activated and protecting the planet from further outside threats. However, when a fury-driven Zim decides that he has to deactivate the Barrier in order to reach his quarry (The Almighty Tallest), the two sets of powerful relics are ejected from the Secret Weapon, where they are later discovered by Treeby, Tank, and Minimoose. After presenting these objects to Bill, he determines that they belong in the Hands of Sonic and Company (who are now engaged in an intergalactic dogfight against Zim), and tasks Minimoose with delivering them to the group.

The Chaos Emeralds are set in the possession of Sonic and a small group of allies as they begin their voyage into a Pocket Dimension in search of Princess Peach and Zim. while inside, the Emeralds are put to use against a syndicate of grotesque inter-galactic beings, with each member of the group (sans Mario, who had gone chasing after Zim) receiving their own Chaos Emerald, and using it to enhance their battle prowess. for example, Moe uses the Emerald's power to enhance the impact and knockback of his punches, resulting in one of the aliens devouring Moe's foe. Later, Sonic, currently stuck to the front of a Rocket Scooter, uses his Emerald to increase his speed faster to escape from his current predicament, as well as to deliver a powerful Spindash, destroying the Rocket Scooter..