Taking refuge on Earth, when Sonic uses his incredible speed and accidentally knock out the power in part of the United States, he catches the attention of Dr. Robotnik and must stop him from using his unique power for world domination.

Sonic, Knuckles, and Tails reunite against a powerful new adversary, Shadow, a mysterious villain with powers unlike anything they have faced before. With their abilities outmatched, Team Sonic must seek out an unlikely alliance.