Knuckles tries to make amends for a past misdeed, but he only succeeds at making things worse.

When Eggman tries to recruit Shadow to help him bring more evil to his video game, it has dangerous consequences for Sonic and his friends.

In his most diabolical plan yet, Dr. Eggman decides to band together with all of Sonic's enemies. Shadow the Hedgehog, joins the fight.

Sonic and friends must face their most dangerous foes in order to prevent a disaster that is going to destroy the universe.

When Sticks' friends tell her to be nicer to (non-anthropomorphic) animals, she becomes attached to a slime-belching robot dog named Buster.

Knuckles feels that the only reason Sonic always bests him is that Sonic has better luck. So, Knuckles tries to run out his bad luck and reset the luck balance of the universe by constantly putting himself in harm’s way.

In hopes of having new additions to his traveling circus, a ringmaster captures Sonic and his friends.

An endangered species wanders into Sonic's shack. He can't move the ugly, smelly animal because of a series of government regulations.

Sonic, Tails and Knuckles wake up a sleeping rock giant who begins rampaging.

After seeing a cross-eyed moose, Sticks is convinced that she and her friends are cursed. They set out to find a mystical marmoset who is the only one who can remove the curse.

Amy decides to accept Eggman's invitation to design his lair for a magazine cover.

Sonic lets martial arts action movie star Tommy Thunder follow him around and observe his "hero process" for Tommy's upcoming role. However, things erupt when Tommy's over-the-top ego clashes with Sonic's and he starts to claim credit for the gang's victories.

The gang learns that sometimes the fiercest things come in the smallest packages when Eggman attacks with his tiniest robot yet.

After Tails gets injured during a battle against Dr. Eggman, Sonic, fearing for his safety, fires him and holds auditions for a new sidekick.

Sonic and Tails rescue some villagers from bandits, but can't get away from the village thanks to all the guilt being thrown onto them.

When Tails' orchard picking machine runs amok, a group of evil scientists believe Tails is one of them.

Knuckles wants to win the village's annual Chili Dog Cook-Off and on his quest to find the perfect ingredients he meets the Pepper People, and their leader Claggerhorn who have been waiting for a savior to bring them the freedom they deserve.

When Amy realizes that Sticks is a pack rat, she forces her friend to have a garage sale to get rid of all the junk that's accumulated in her burrow. During the sale, a secret locked door to an underground world is removed and an invading horde is set free.

Dave the Intern inadvertently takes down Eggman and becomes a true vilain.

When it’s revealed that Dr. Eggman is not actually a doctor, he becomes a joke and must go back to school to finish his Ph.D. in evil.

Eggman’s anti-gravity ray causes chaos in Hedgehog Village. With newfound confidence, Cubot tries to bring enlightenment to the villagers.

After being invited to a fancy gala, Sticks admits she does not know how to behave like a lady.

After being injured in a battle against Sonic, Egghead decides to take Sonic to court to receive justice.

When Dr. Eggman markets his own brand of tomato sauce, the others are suspicious of possible ulterior motives.

After Sonic and the others use Eggman's technology against him, he swears off technology for good; Lightning Bolt Society unleashes an attack.