After a disastrous failed mission, Sonic laments that they can't go back and prevent Robotnik's take-over. Dulcy tells them they can and takes Sonic and Sally to the Floating Island where they find the "Time Stones".
Sonic attempts a solo rescue to prevent prisoners from being roboti-sized and is hit by a Memory Scrambler that erases short-term memory.
The Freedom Fighters run into a Swashbuckler, named Ari, battling Swat-Bots. Sonic diverts them, allowing Ari to escape. After hearing that Robotnik is holding his band of Freedom Fighters hostage, Ari decides to help Sonic free them.
Sonic reluctantly takes Tails with him to the Big City to find some cotter pins for the Freedom Fighters catapults. While in the City, Sonic is nearly eaten alive by his old dog Muttski, now a roboti-sized guard dog in the Junk Heaps
Tails brings a new friend home to Knothole - a baby Terra-Pod who has strayed from the herd that is currently migrating. Sonic, Sally, and some of the other Freedom Fighters return the Baby-T to its mom and the rest of the herd.
Robotnik severely upsets the ecosystem above and below the surface, when he sends explosive, Robotnik snake probes drilling deep under ground in search of oil lakes.
When Sonic and The Freedom Fighters take out Robotnik's main computer, they're trapped by Swat-Bots in an underground tunnel, only to be rescued by a handsome teenager named Griff. Griff takes them deep beneath the Big City.
The Freedom Fighters, with new addition, Dulcy, develop a De-Roboti-sizer and try it out on Bunnie. It's a success and, against Sally's wishes, Sonic battles Robotnik's newest weapon, a Virtual Reality Shriek-Bot.
Sonic reluctantly takes Tails with him to the Big City to find some cotter pins for the Freedom Fighters catapults. While in the City, Sonic is nearly eaten alive by his old dog Muttski, now a roboti-sized guard dog in the Junk Heaps
Tails brings a new friend home to Knothole - a baby Terra-Pod who has strayed from the herd that is currently migrating. Sonic, Sally, and some of the other Freedom Fighters return the Baby-T to its mom and the rest of the herd.
Robotnik severely upsets the ecosystem above and below the surface, when he sends explosive, Robotnik snake probes drilling deep under ground in search of oil lakes.
Santa Claus has made an announcement - he is retiring and has picked the perfect successor - "Robotnikclaus"! Sonic and his sister resolve to persuade Santa to return and set Christmas straight. When the two track down the Santa who made the announcement, they discover he is just a phony robot and the real Santa Claus is being held prisoner.
Coconuts inadvertantly creates a "super power" formula, when his janitor bucket spills in the lab. Robotnik falls into it and becomes "Super Robotnik", then challenges Sonic to a fight, with all of Mobius as the stakes. With Prof. Von...
Sonic and Tails help out an Owl/Chilidog Diner owner, named Bert Whoo, when Robotnik uses his henchbots to try to collect protection money. When the henchbots prove to be no match for Sonic.
Robotnik invents a robot coach -- the "Coachnik", to put S and G through a "Training Camp" to improve their skills. Then Coachnik puts a bomb in Grounder's head as a booby trap for Sonic, and a football game ensues with Grounder's head as the ball.
Robotnik decides to cripple Mobius' three major transit systems: Rail, Air, and Sea in order to fully gain control of the planet. Sonic has to circumnavigate the planet in order to save the day.
Robotnik invents a giant AMNESIA RAY in his booby-trapped PINBALL FORTRESS (based on the Sonic game per Roger Hector) in order to erase the bad memories the Mobius citizens have of him, and make them think he's a great guy.
When Tails invents a Hover-Hanglider for Sonic's birthday, Sonic suggests he assist Prof. Von Schlemmer with his new Robotnik-Nabber machine. Robotnik hears about this, and poses as Von Schlemmer to trick Tails into inventing a Sonic-Nabber instead.
Sonic plays Cyrano to bring Robotnik Jr. and Breezie together. The problem is, Breezie's crazy about Sonic. So Sonic gets out of the way, but when he does, Junior is captured by Robotnik, and Breezie comes to the rescue, finally falling for him.
When Wes Weasley returns to the Fortress, Coconuts tricks Robotnik into signing an IOU so he can buy thousands of Mobiums worth of magic tricks to use on Sonic. In the end, Sonic goes free, and Robotnik is forced to pay Wes the massive IOU debt.