
Sonic defends planet Mobius from the evil Dr. Ivo Robotnik.

Sonic and the Freedom Fighters travel to Robotnik's lab hoping to decipher his Roboticizer system.

When Sally uncovers Robotnik's plan to seed the clouds with toxic rain, they attempt a mission to sabotage it.

When Sonic and the Freedom Fighters take out Robotnik's main computer, they're trapped by Swat-Bots in an underground tunnel.

Sonic defeats Robotnik's vehicle, which is designed to locate living tissue, during a mission to the Badlands; when Sonic returns, the Freedom Fighters hold a social gathering for him.