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The speedy blue hedgehog Sonic with sidekick Tails and pals Knuckles, Amy and Sticks tries to ward off the evil plans of Dr. Eggman, who is hellbent on taking over the world. Sonic faces regular battles with Eggman's henchmen, including loyal robots Orbot and Cubot, evil interns, and giant, robotic monsters.
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.
Eggman discovers that an asteroid is on a collision course with the planet! It's up to Sonic and his friends to destroy the asteroid.
Sticks is fed up that all the news is fluff, so with Tails' help, she creates a podcast to speak truth to power. It becomes so popular that the TV news producer decides to fire Soar and replace him with Sticks. But in order to report the truth, Sticks is pressured into toeing the company line.
Sonic and Tails are working on an invention to make Sonic even faster. Unfortunately, Sonic goes so fast that he eventually disappears. Tails is nervous. Did he disintegrate Sonic? Meanwhile, Sonic is alone in another plane of existence where he can only see ghostly images of his friends but can't communicate with them. When Eggman decides to attack, the gang battles him while protecting Tails so he can work on a solution.
Sonic is pestered by Mark the Tapir, who weasels his way into a position as Sonic's assistant. Eventually, Mark crosses the line and captures Sonic and his friends.
Eggman challenges Tails to prove he is a genius by capturing Sonic.
After a particularly harsh defeat, Eggman comes to the conclusion that he never wins against Sonic because he is always facing him on favorable ground. So Eggman concocts a plan to have Sonic fight him underwater. Motivational speaker Soar the Eagle will have to use all his coaching talents to help Sonic overcome his phobia of the water in order to defeat Eggman.
Sticks discovers Dreamcaster, a mysterious figure trying to hypnotize the village in the middle of the night. The gang doesn't believe Sticks, telling her Dreamcaster isn't real and her paranoia is out of control.
Tails takes a failure during a battle with Eggman to heart. He feels that even though he's the smart one in the group, he's just not smart enough to help Sonic and the gang. So he creates a machine to duplicate himself and form a "brain trust." But will he and his duplicates be smart enough to defeat anything that Eggman can come up with?
After a very humiliating defeat at the hands of Sonic and the gang, Eggman returns to his lair and takes out his frustrations on Orbot and Cubot. The robot duo has finally had enough! Down tools! They're going on strike!
The good people of the Unnamed Village feel that things have gotten pretty lawless. They figure there's not a lot they can do to stop evil, so they license, regulate, and tax it. Eggman fails the evil test and must wait 90 days to do evil, so Eggman decides to use Orbot as his front. Orbot will get an evil license and Eggman will be the puppet master. But Orbot's ego gets out of control and Eggman must get Sonic's help to defeat The Evil Dr. Orbot.
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.
Sonic stumbles upon an ancient mech suit. It makes him more powerful, but soon Sonic becomes dependent on it, and it starts to change his personality.
Eggman builds a giant new robot to defeat Sonic. He programs it to know everything about the Blue Blur, but things don't go as planned - with all FiendBot's knowledge of Sonic, it doesn't want to destroy him, it wants to be his friend.
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.
Knuckles is upset when he wins a lamp in a raffle and it dawns on him that he doesn't have a home in which to keep it. He sets out to rectify the problem by getting a job.
When the Village's power source, the Meroke Chrystal, stops functioning, the gang must go in search of a replacement. They need to solve a series of puzzles in a trap that was built by the ancients to get it.
When the people of the Unnamed Village find out that their village used to be called "Badgerville" after Sticks' evil ancestor, anti-badger sentiment runs rampant. They decide to rename the town to something more agreeable, and an election is held. Eggman buys votes and is able to rename the village Eggman City, then uses a hidden clause to seize power and become a worse tyrant than Sticks' ancestor. In the end, Sticks saves the day, takes back the village, and renames it Hedgehog Village, after Amy, the friend who stuck by her.
Dr. Eggman creates a new line of robot employees for Meh Burger, but there is more to these robot employees than meets the eye.
Amy adopts one of Eggman's Bee-Bots after nursing it back to health. Eggman is unhappy with this and tries to reclaim it.
Roger Craig Smith
Sonic / Additional Voices (voice)
Colleen O'Shaughnessey
Tails / Additional Voices (voice)
Travis Willingham
Knuckles / Additional Voices (voice)
Cindy Robinson
Amy Rose / Additional Voices (voice)
Nika Futterman
Sticks / Additional Voices (voice)
Mike Pollock
Dr. Eggman / Additional Voices (voice)
Kirk Thornton
Orbot / Additional Voices (voice)
Wally Wingert
Cubot / Additional Voices (voice)
Bill Freiberger
Comedy Chimp / Lady Walrus (voice)
