Sonic and Tails escape underground from Scratch and Grounder, but they are held captive there by a miserly mole named Spelunk.

Sonic and Tails infiltrate Robotnik's new Casino Night Zone to stop him and his henchmen from scamming a group of sheep into becoming Robotnik's slaves.

Robotnik pursues Breezie and Robotnik Jr. in order to find out why they betrayed him with the intent of building a perpetually loyal robot wife.

Robotnik constructs a robot son in order to help him with his conquest of Mobius.

Robotnik makes chewing gum that makes the consumer as fast as Sonic.