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.

Dealing with Shadow's anger, Eggman switches places with his counterpart from a dimension where Sonic doesn't exist. Now Sonic must deal with both Eggmen, plus Shadow and Metal Sonic, before the two dimensions collapse.

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

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

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

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.

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.

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.

Despite Eggman attacking with his tiniest robot yet, it poses a problem to the gang and to the village.

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

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.

During a fight against Eggman, Knuckles suffers amnesia. His friends try to help, reminding him of his worst blunders via flashbacks. But he becomes more depressed when he learns that he is the last of his kind - the final echidna. Feeling all alone in the world, Knuckles sets out to find a foster family among the Villagers who might be willing to take him in.

The gang becomes suspicious when Froglodyte Og comes to the surface world. They fear their suspicions may be correct when a Froglodyte army arrives in The Village.

When it's revealed that Eggman isn't actually a doctor, he becomes a joke and must go back to school to complete 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.

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.

Amy decides to open her own restaurant which causes a rivalry with their former hang out and Dave the Intern.

Sonic allows Eggman to be his social media friend – a kindness he will surely regret.

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