Shadow has the power of chaos control, which enables him to warp time and space. Shadow was created on the space colony ark by Doctor Eggman's grandfather, Gerald Robotnik. Shadow at first thought that he had made a promise to his childhood friend Maria to destroy the Earth and all the humans and then later realizes that wasn't Maria's actual goal. His encounter with Maria may or may not have been real, but it is certain that Gerald tweaked his memories to make him think that Maria wanted the Earth destroyed. Shadow nearly dies by attempting suicide in Sonic Adventure 2, his first outing, but somehow lives to come on the upcoming Sonic Heroes.
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