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Sonic frees a prisoner who has been locked at Robotnik's Fortress for 30 years who wants to find his long lost girlfriend which Robotnik also loves.
Robotnik creates a robot fox family when he finds out that Sonic is trying to find Tails a new home to keep him safe.
Robotnik buys new gadgets from an enterprising salesman to help Scratch and Grounder catch Sonic, but winds up regretting his purchases when they keep backfiring.
Robotnik is after the Power Gems from the city of Submerbia and Sonic and Tails are hired to stop him.
Robotnik creates a robot Sonic suit in order to ruin his reputation.
Robotnik fools Captain Rescue into capturing Sonic after the aging superhero lets his guard down, so Tails must convince Rescue to be his old self again in order to save Sonic.
An asteroid is heading for Turtle Town and Robotnik offers to save it, but only if Sonic agrees to play in the Robolympics against him and his robots.
When Sonic saves a female hedgehog named Breezie, he falls in love. Sonic does not know that Breezie is a robot that Dr. Robotnik created to keep Sonic occupied while he floods a village near his fortress.
Sonic and Tails escape underground from Scratch and Grounder, but they are held captive there by a miserly mole named Spelunk.
Grounder accidentally puts a "genius chip" in his head and it makes him so smart that he easily captures Sonic and even takes over Robotnik's operations.
Sonic and Tails infiltrate Robotnik's new Casino Night Zone to stop him and his henchmen from scamming a group of sheep into becoming Robotnik's slaves.
Scratch suffers a blow to the head and believes that he is his favorite television character, Edgar Eagle. Sonic uses this to his advantage in preventing another one of Robotnik's schemes.
Robotnik reprograms a machine created by Von Schlemmer capable of bringing dreams into reality and unleashes a dream monster upon Mobius.
Sonic tries to save a gorilla that is under Robotnik's control, while Coconuts finds the gorilla's lost baby and plots to use it against Sonic.
On the way to stop a train of explosives from arriving at Robotnik's munition factory, Sonic and Tails must deal with a duo of bears named Big Griz and Mad Mike after Scratch and Grounder tell them that Sonic and Tails are the enemies.
Robotnik's obnoxious mother visits her son on her birthday and expects a present. After he fails to destroy a nearby forest as a present, however, she decides to capture Sonic as her own gift.
Sonic must save a family of sloths from Dr. Robotnik's slow-motion ray. But when he himself is slowed down by Scratch and Grounder, Tails and the sloth family must take action.
Tails adopts a squishy creature from another dimension named Goobster, who turns out to be a black hole.
Robotnik and a rival named Brandon Quark try to cooperate in capturing Sonic. However, Sonic tricks them into becoming enemies, and they try to outdo each other.
Robotnik's insane cousin, Dr. Warpnik, captures Tails and lures Sonic into his Zone of Confusion in order to enact revenge on Robotnik for banishing him.
Momma Robotnik visits her son, and after he fails once again, she disowns him and decides to adopt Sonic as her own son in order to capture him.
Tails gets a megadose of Robotnik's growth gas and grows quickly to monstrous proportions, eating everything in sight and terrorizing the countryside.
When Sonic and Tails are captured by Scratch and Grounder, Sonic creates a diversion by telling the duo the story of their creation.
Sonic becomes the sheriff of Tranquil Gulch, in hopes of keeping Robotnik's robots from harassing the locals.
An intergalactic huntress visits Mobius, capturing various citizens and falling in love with Robotnik.
When Scratch and Grounder use Robotnik's latest invention to turn Sonic to stone, Tails attempts to foil the duo to ensure Sonic's safety.
Robotnik's attempt to cause Sonic to age rapidly with his newest device backfires, turning him and Tails, and later himself, into babies.
Robotnik pursues Breezie and Robotnik Jr. in order to find out why they betrayed him with the intent of building a perpetually loyal robot wife.
Robotnik has unleashed his Stupidity Ray on Mobius, knowing that the newly-stupefied Mobians will be too brain dead to stop him.
Robotnik seemingly announces his surrender to Sonic, and he invites him to a resort in his gratitude.
Robotnik constructs a pushy robot coach in an attempt to increase Scratch and Grounder's fitness.
When Robotnik opens up a resort to make resident Mobians his slaves, Sonic enlists the help of some robots from an area of Mobius called Scrap Valley.
Sonic and Tails help an alien prince fix his space shuttle so he can return to his home planet for his coronation before his younger brother is crowned in his place and has Mobius destroyed.
On Sonic's birthday, Tails builds a flying bicycle. Realizing Tails' potential with mechanics, Professor Von Schlemmer invites Tails to be his research assistant.
Robotnik constructs a robot son in order to help him with his conquest of Mobius.
Coconuts acquires a magic wand and magical gadgets from Wes Weasley, and attempts to master them.
Robotnik goes time-traveling to find the four Chaos Emeralds that bestow the user unlimited power. His first stop is the time of Blackbeard the Pirate, where he enlists the pirate's help to find the first emerald.
Robotnik's next stop in his time-travel is the Middle Ages, where the second emerald is. Sonic follows him, but Robotnik, with the unwilling help of a local wizard, obtains the emerald and takes over the kingdom.
In his next time-travel stop, Robotnik plans on erasing Sonic's family tree in order to get the third emerald.
Despite the intervention of Sonic and Tails, Robotnik obtains the fourth and final emerald in prehistory. With the emeralds gathered together, Robotnik uses them to become an all-powerful being.
Sonic comes to the rescue of a town that is held for ransom by Robotnik's crime syndicate.
Robotnik imprisons a satirical cartoonist for making fun of him in his comic book, much to the chagrin of his biggest fan, Sonic.
Scratch and Grounder use a ray gun Robotnik invented to transport Sonic, Tails, and Robotnik into a book of fairy tales.
During a fair in his honor, Sonic's shoes are stolen and he and Tails use detective intellect to find the thief.
A chemical accident caused by Coconuts ends up giving superpowers to Robotnik, who quickly uses them to threaten Mobius's world leaders and publicly humiliate Sonic.
Robotnik threatens to demolish an airport, a lighthouse, and a train station. Sonic is forced to travel to all three places in order to remove the bombs.
Robotnik sends Scratch and Grounder into space to pillage the asteroid belt, with Sonic and Tails in pursuit.
Robotnik attempts to brainwash MacHopper, a friend of Sonic's into doing his dirty deeds, but an explosion causes his memory to become unstable.
Sonic and Tails babysit a trio of unruly baby beavers who end up being abducted by Scratch and Grounder.
Robotnik makes chewing gum that makes the consumer as fast as Sonic.
When Throbbin Screech features Sonic on his talk show, Lifestyles of the Very Good, Robotnik kidnaps his niece in order to be featured on the show.
Sonic and Tails get arrested for speeding due to Robotnik's nefarious hypnotizing scheme.
Sonic and Tails enter a car race in order to save an orphanage that Robotnik threatens to shut down.
Sonic, Tails and a group of mole miners are hit by Robotnik's shrink ray and must work together to reverse the effects.
Outraged by a popular song about Sonic, Robotnik outlaws music on Mobius and takes the song's composer captive with the intent of creating his own song.
Robotnik plans to freeze all of the Mobians in order to make them obedient.
When Momma Robotnik threatens her son into campaigning for the Mobius presidency, Sonic decides to run against him.
Robotnik forces a starving village of rabbits into building a statue of himself.
Robotnik takes control of the local amusement park on Sonic's birthday and uses it to try to finish him off.
Sonic and Tails help a mermaid hedgehog named Merna save her underwater city from the wrath of Captain John Paul Memo.
Robotnik captures Kwai Chang Crane, a martial arts master, and uses him to turn Scratch and Grounder into effective ninja to defeat Sonic.
A pickpocket named Easy Eddie picks at Robotnik's Chaos Emerald ring, much to his anger. Sonic must keep Easy Eddie hidden so that he can discard the ring.
When Sonic mysteriously vanishes, Tails, Professor Von Schlemmer, and a pilot named William le Due search for him in the Pyramid of Kommamachs.
Scratch and Grounder build a robot of their own who soon runs away and ends up befriending Sonic.
Wes Weasley has sold out to Robotnik, and lures Tails, Sonic and all of their friends to a yacht under the guise of a "Hero of the Year" ceremony to thank Sonic.
