Sonic and the Freedom Fighters travel to Robotnik's lab in hopes of deciphering his roboticizer system.

A great accomplishment could backfire on the gang.

Sonic loses his memory and is manipulated by Snively.

Sonic and Sally must travel through time to change the course of the war with Robotnik.

Sonic and Sally must clean up the mess created by their time travel.

After Dulcy exhibits strange behaviour, Sally discovers she's going through a "rites of passage" stage of her adolescence.

Sonic and Nicole enter a void in search of the missing Sally and Bunnie.

Robotnik seeks the Drood Henge scrolls, which give the location of the two powerful Deep Power Stones. Uncle Chuck warns Sally about it and Sonic and Tails find Robotnik already has one of the stones. The Freedom Fighters now have to find the second one before it's too late.

After Antoine saves Sally's life during a raid, Sonic can't stand his bragging and zips in to see Uncle Chuck, who finds out his "bug" in Robotnik's HQ is malfunctioning.

When a Pod lands in Knothole, Sonic and Sally realize the Doomsday Machine is already in operation. The Freedom Fighter groups break into the Doomsday Machine, only to find Robotnik let them in.