While on a mission to the big city to replace Nicole's malfunctioning microchip, Sonic and Sally encounter the Guardian, a mysterious cloaked figure who guards a dormant wizard named Lazar and his computer of evil spells.
Sally, Rotor, Bunnie and Antoine take off in a homemade airplane, bound for an ancient city hidden deep in the Great Mountains, while Sonic follows via his favorite transportation, his sneakers.
Sonic and the Freedom Fighters journey to Robotnik's lab in hopes of deciphering his roboti-sizer system. While underground, Sonic spots his now roboti-sized Uncle Chuck aboard a Badlands bound mine-train and devises a plan for his rescue.
Sonic and The Freedom Fighters journey to Robotnik's underground air base in a mission to reprogram the launch data on Robotnik's fleet of Stealth-Bot aircraft. While attempting to reprogram the Stealth-Bot computer system.
Bob and the gang have got a big job on - repairing some pipework in Farmer Pickles field. / Bob, Scoop & Muck have to make repairs to a tunnel. When they arrive on site, Bob sends Muck ahead into the tunnel with a load of bricks.
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.
While lost in the wastelands of Mobius, Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort.
Rumor has it that Queen Aleena's journals are buried in the city of Tashistan. Sonic and his siblings search the city for the scrolls.
During a mission to one of Robotnik's factories, Sally is taken prisoner by Robotnik and Snively, who construct a roboti-sized "Sally" clone, complete with Sally's personality, and mannerisms. The double tricks Sonic into rescuing "Sally".
Sonic and The Freedom Fighters journey to Robotnik's underground air base in a mission to reprogram the launch data on Robotnik's fleet of Stealth-Bot aircraft. While attempting to reprogram the Stealth-Bot computer system.
Bob and the gang have got a big job on - repairing some pipework in Farmer Pickles field. / Bob, Scoop & Muck have to make repairs to a tunnel. When they arrive on site, Bob sends Muck ahead into the tunnel with a load of bricks.
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.
Robotnik's momma escapes from the home for mothers of villains and demands her birthday present! When she endangers Sonic and Tails, and they manage to have her taken back to the home, even Robotnik is glad to see her go.
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.
Tails and other Mobius citizens are lured into Robotnik's robotic games of chance, and when they lose they're sent to slave labor camps. Sonic rescues Tails and the others by beating the house in games of chance at Robotnik's Casino.
When Scratch and Grounder use Robotnik's new Slo-Mo Ray Gun to capture Sonic, Tails rescues him by reversing the gun and turning it on a tribe of friendly Tree Sloth People who become a high speed commando strike force against Robotnik.
Sonic saves a damsel in distress, and falls in love with her, not knowing she's a robot built by Robotnik. But when she has a chance to trap him, she helps him escape, realizing she has fallen for him.
Sonic outsmarts Coconuts, then stumbles into a Convention of Bounty Hunter Robots where Robotnik puts a price on his head. After Sonic defeats all the Robot Bounty Hunters, Robotnik creates Scratch and Grounder to be his S.S.S.S.S. Squad.
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.