... the ultimate life form his grandfather had created. Dr. Eggman hoped to use Shadow to conquer the world. Shadow, having sworn revenge on the humans who caused the death of Maria (due to Gerald's plan), tricked Eggman, along with Rouge the Bat, into helping him collect all seven Chaos Emeralds. The trio placed them in the ARK, nearly allowing it to crash into Earth. Amy Rose managed to trigger Shadow's true memory of Maria and her wish, and the ARK was placed back into orbit using his skill, Chaos Control, using up the last of his energy and sending him falling to Earth, seemingly dead.
In Sonic Heroes, Rouge discovered Shadow in a stasis tube in Eggman's secret base. Suffering from amnesia and unable to remember anything except his name and brief images of Maria's death, Shadow joined forces with Rouge and E-123 Omega in order to track down Eggman. After defeating the final Eggman robot, Rouge stumbled into a room full of what appeared to be Shadow clones, and deduced that Shadow was also a clone. Omega then walked in and stated that the original Shadow must be alive for clones to exist, and began to search for him. They then went on to fight Metal Sonic with the others.
In Sonic Battle, Rouge saves Shadow while they are investigating Dr. Eggman's se...