SEGA officially announces the development of the game Shadow the Hedgehog as a spin-off from the Sonic the Hedgehog series.
SEGA releases Shadow the Hedgehog for the GameCube, PlayStation 2, and Xbox.
After release, Shadow the Hedgehog receives a mix of critical feedback citing its darker tone and gameplay style as a major change from the Sonic franchise.
Maria Robotnik, Shadow's close friend and Professor Gerald Robotnik's granddaughter, is killed during a military raid on the Space Colony ARK.
After the raid, Shadow makes his way to Earth, carrying Maria's final wish to bring peace to humanity.
Shadow battles against G.U.N. soldiers who are trying to capture or eliminate him due to his supposed threat to humanity.
Throughout the game, Shadow gradually recovers his lost memories and regains control of his Chaos powers.
Shadow fights the alien warlord Black Doom, who manipulated him and threatens Earth's safety.
Shadow chooses whether to embrace his past as a weapon of destruction or to protect humanity and carry out Maria's wish for peace.
