Pocket Dimension

Outside time and space exists a pocket dimension, accessible via wormhole generated by the Infernal Machine. With no one inside, this realm appears simply as an empty black void—but when living beings are placed within, the pocket dimension can alter its appearance and generate entire landscapes based on people's recollections. For instance, when Sonic, Mario, Knuckles, Calvin, Hobbes, Moe, Invader Skoodge, and GIR are sent here during the events of the "Dimension" saga (to rescue Princess Peach from Zim—both of whom were sent here by Eggman Nega, the controlling force behind the Infernal Machine), the first landscape to be generated is that of the Green Hill Zone of South Island, which was the beginning of Sonic's first adventure to track down Doctor Eggman ("Sonic the Hedgehog").

However, seeing as multiple beings are sent into the pocket dimension, its landscape becomes subject to random alterations, basing itself on more than one individual; this occurs when the group has finished traveling the Green Hill Zone, and the area abruptly changes form, to that resembling the original appearance of the Mushroom Kingdom ("Super Mario Bros."). Additionally, as the alliance later encounters the alien horde, come to battle and capture Spaceman Spiff (Calvin), the landscape becomes that of Angel Island. Given this environment-altering nature, there seem to be no limits on how far the void can stretch on, or how much it can accomplish when it comes to generating landscapes and entities—such as the original Doctor Robotnik (and his Eggmobile) from the Green Hill Zone.

(editing shall recommence soon)