UltimateLifeform

Shadow is the "Ultimate Life Form", created aboard the Space Colony ARK over fifty years ago by Professor Gerald Robotnik. He is the final result of Project Shadow, a government experiment that was only completed by infusing Shadow with the DNA of the alien Black Doom. After his birth, Shadow befriended Gerald's granddaughter, Maria. However, the Guardian Units of Nations (G.U.N.) deemed the ARK a threat and raided it, resulting in the captures of Shadow and Gerald, and the death of Maria. Driven to madness, Gerald altered Shadow's memories to one day seek revenge.

Shadow remained in stasis for decades until he was freed by Gerald's grandson, Doctor Eggman. Initially motivated by vengeance, Shadow fought Sonic and friends until his true memories of Maria were restored, inspiring him to help save the world from Gerald's doomsday plot. However, Shadow fell to Earth and lost his memories as a result. Shadow would only learn the truth of his existence once he stopped the Black Arms invasion of Earth. He has fought for Maria's wish of peace ever since, acting as a dark hero who protects the Earth and all its inhabitants.

Currently, Shadow works at the G.U.N. Headquarters as part of Team Dark with Rouge and Omega. The reason for joining G.U.N. even after causing him pain, Shadow thought this would be the best way to honor Maria's memory.