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 Sally uncovers Robotnik's plan to seed the cloud with toxic rain, they attempt a daring mission to sabotage the dirigible-like craft being transported by land vehicles. Mission fails when Sally, Bunnie and Antoine are captured.
When Robotnik launches a spy-orb that will uncover the Freedom Fighter's Knothole location, Sonic and Robot launch themselves up to the orbiting spy-sphere aboard a home-made rocket powered by Robotnik's discarded booster engine.
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.
Sonic is hired into an obvious trap when a frustrated Robotnik decides to appeal to the Hedgehog's ego and announces a "race to determine the fastest on Mobius".
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.
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.
When Robotnik launches a spy-orb that will uncover the Freedom Fighter's Knothole location, Sonic and Robot launch themselves up to the orbiting spy-sphere aboard a home-made rocket powered by Robotnik's discarded booster engine.
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.
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.
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 installs a new "obedience microchip" in Scratch and Grounder and orders them to drill for a rare mineral in a tropical mountain. With his Freezomatic machine, Robotnik covers the mountain in ice and runs a Hermit out of his home.
Sonic leaves Tails in charge of protecting a squirrel village food supply, when he zips off to stop a dam from breaking. Robotnik sends Scratch and Grounder after Tails.
Mobius is suffering a crime spree and all the evidence points to Sonic as the culprit. But the real thief is a lab rat wearing a high-tech vehicle suit who was sent by Robotnik to discredit our hero.
Sonic joins up with a group of Dr. Robotnik's rejects who have been banished to the dump and helps them understand that their shortcomings were really their strenghs.
Tails adopts a cute and fuzzy pet named Walter who turns out to be a black hole who sucks up everything in Mobius. Realizing that Walter is from another dimension our heroes have to return him.
Sonic turns detective to solve the mystery of his missing Red Sneakers--and just in time to get them back and stop Dr. Robotnik's latest attack on a peaceful Mobius village.