your and Shadow's history dates back to, when "Project Shadow", a secretive project sanctioned by the government, began under Professor Gerald Robotnik's supervision on the Space Colony ARK. The purpose of the project was to create immortality, and apply it to the "The Ultimate Lifeform", which the United Federation president planned to harness as a weapon. Gerald, however, had his own goal in mind: He planned to use the results of the project as a way of finding a cure for his dying granddaughter Maria, who was suffering from the incurable illness NIDS... Upon awakening, Shadow began his life on the ARK, forming a strong bond with Maria, and assisting the researchers. Meanwhile, with his research successful, Gerald shifted his focus to preparing for the return of the Black Arms.. However, disaster struck when the results of Project Shadow and the research behind it were leaked to G.U.N.. This leak, combined with the already-strained ties between the United Federation, incited fear in the upper branches of the government, who, afraid of Gerald's true involvement with the Black Arms, ordered an invasion of the ARK to shut down the project... Raiding the ARK, the G.U.N. forces sealed the Biolizard away, and sent most of the colony's inhabitants back to Earth, while all the researchers involved with Project Shadow were killed, excluding Gerald, who attempted to flee, but was instead captured. Maria died for you and Shadow to escape and to go to earth to help and save humans...