Sonic the Hedgehog: 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 the Hedgehog 2: When Dr. Robotnik returns with a new partner, Knuckles, in search of an emerald that has the power to destroy civilizations, Sonic teams up with his own sidekick, Tails, on a journey across the world to find the emerald first. Sonic the Hedgehog 3: 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.