Sonic is mistaken for Shadow and falsely arrested.
Eggman accidentally frees him during a raid on Gerald's island prison, and Shadow makes clear his intent to make humankind pay for Maria's death. Joining Eggman in his scheme are two new accomplices: Rouge the Bat, a jewel thief with shady motives, and Shadow, a genetically-enhanced hedgehog who touts himself as Gerald's best achievement, and is able to teleport using Chaos Emeralds. Using the Chaos Emeralds to power the ARK's Wave-Motion Gun, Eggman can strong-arm the President into accepting his new world order. Professor Gerald Robotnik moved to the ARK so he could research a cure for his terminally-ill granddaughter Maria, but the project was mothballed by the military, causing Gerald to flip out and become incarcerated. Ivo 'Eggman' Robotnik has hatched a new plot to conquer the world: reviving his grandfather's legacy, the now-abandoned Space Colony ARK. It is historic for three reasons: it's one of the Dreamcast's final releases, being released three months after the Dreamcast's official discontinuation, it came out on the franchise's 10th anniversary, and it wound up being the last Sonic game made before Sega quit making consoles and went third-party.
Sonic Adventure 2 was the long-awaited sequel to Sonic Adventure.
