Sonic conquers Robotnik's latest evil - a vehicle designated to locate and destroy living tissue matter - during a solo mission to the Badlands. Upon Sonic's return, the Freedom Fighters honor him with a victory party.
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
Antoine decides to study martial arts but after he wrecks most of Knothole Sonic sends him off to practice in the woods. //Tails begins his training to become a real Freedom Fighter by learning tracking skills while on a camping trip.
On a mission to contact the first Freedom Fighters on the King's List, Sonic and the others are forced to travel through a tunnel which carries a "curse" against all intruders.
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.
After an accident, Scratch thinks he's an eagle and on the side of Sonic. In order to impress his his new lady love, Scratch assists Sonic in an excursion into Robotnik's Fortress to turn off a dangerous force field.
An elderly, out of shape, overweight superhero keeps trying to help Sonic battle Dr. Robotnik, and keeps getting him in more jepordy. Sonic helps the old hero regain his self respect and they team up to battle Robotnik's latest scheme.
When Sonic decides to find Tails a suitable foster home, Robotnik finds out, and creates a robot fox family which poses as Tails' long lost parents. Sonic leaves Tails with the fox family, but finally realizes they're robots and rescues Tails.
Big Griz, leader of a group of biker-bear rebels, mistakes Scratch and Grounder for Sonic and Tails, and teams up with S and G to attack the real Sonic and Tails.
Sonic rescues Lucas, a rival of Robotnik's, from Robotnik's dungeons. But Robotnik will do anything to keep Lucas from finding his lost love, Lucinda, including proposing to her himself.
A fast talking, travelling salesman named Wes Weasley sells Robotnik various hedgehog-catching gadgets, including the Darkenator, the Super-duper Gravity Stopper, and the De-Atomizer.
Outraged by a new hit song written about Sonic, Robotnik outlaws music on Mobius then takes pop star, Catty Carlisle captive. With his MD (Music Destroyer) Robot, Robotnik terrorizes the music loving Mobius population till Sonic rescues Catty.
Coconuts is exiled by Robotnik to a remote jungle, where he uses a giant baby ape to destroy villages. But Sonic exposes Coconuts as a robot, and the baby ape's real Dad takes Coconuts and the baby ape away for a spanking.
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.
Sonic and Tails befriend a pair of aliens who crash land their spaceship on Mobius. Sonic has to avoid Robotnik's ULTRA-GRAVITIZER (sort of a hedgehog flypaper) to help fix their ship and blast-off back home.
When Tails gets trapped in the "Warp of Confusion" (an Escher-like world of another dimension) by Robotnik's cousin, Dr. Warpnik, Sonic comes to the rescue and traps Robotnik and his badniks in the warp.
In order to free Sketch Lampoon (a satirical comic book artist) from Robotnik's new high security prison, Sonic allows himself to be captured, then makes a high speed rescue and escape.
A homecoming is interrupted for Sonic, Sonia and Manic when Sleet and Dingo arrive to collect back taxes after returning to their birthplace.
A captain of the Queen's guard is captured before he can reach the secret rendezvous where he was to meet Queen Aleena.