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

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.