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While trying to retrieve the 7th Chaos Emerald from Dr. Eggman, Sonic and Friends are transported to the human world where Sonic is rescued by a boy named Chris.

Sonic begins his adventures in a new world.

When Sonic discovers that Cream and Cheese are being held captive by the military, Sonic, with the help of Chris' grandfather Chuck, finds and frees them only to be caught in a trap until Tails comes to the rescue.

Sonic tries to rescue Cream and Cheese.

When Eggman tries to use E-23 to take over the world Amy, Knuckles and Tails launch an unsuccessful counterattack, until Sonic arrives, and with a ring from Tails, destroys E-23 and saves Amy with the help of Knuckles.

Dr. Eggman threatens the city.

Chris' teacher is replaced with the President's spy, and the first Chaos Emerald appears at a construction site. It's then a race to the stone between Eggman and Sonic, with Chris stealing it from Eggman's mobile, and Sonic rescuing him from a nasty drop.

A Chaos emerald is located.

After Eggman tricks Knuckles into blaming Sonic for being stuck in the human world, Knuckles challenges Sonic to a duel allowing Eggman to capture Chris, Amy and Tails using E-47, until Knuckles realizes he's being duped.

Knuckles and Sonic take off the gloves...

Eggman tries to use his robot to brainwash Chris' class but when Intellihente winds up teaching more than brainwashing, Eggman steps in to put the children in permanent detention until a worried Sonic arrives, destroys the robot and saves the class.

Eggman tries to use a robot to brainwash children.

When Mr. Stewart drops by for a surprise visit, Chris and Chuck are able to keep Sonic and Friends' stay a secret but after the S-Team Leader, Chris' uncle, arrives things get messier and everyone including Ella and Mr. Tanaka find out Chris' secret.

Chris' mother is upset.

After Eggman discovers that he is being watched by the military he sends E-90 to swallow the satellite, but this disrupts all television so Chuck and Tails turn Tornado into Tornado X allowing Sonic to enter space and destroy E-90.

Sonic must defeat Dr. Eggman's latest invention, the e-90 Super Sweeper.

After Chris, Amy, Cream and Cheese arrive at a resort, Eggman appears and tries to take over but Sonic arrives and tries to stop him only to be saved by Amy from E-39.

Sonic and gang visit a new vaction spot.

It's Team Sonic vs Team Eggman in a baseball game for a Chaos Emerald, Team Sonic falls behind at first but then wins with a Sonic super-play, only to have Eggman steal the Emerald in the end.

Dr. Eggman challenges Sonic and friends to a game of Baseball.

The President plants a fake emerald to try and attract Sonic but Rouge takes the bait instead and winds up searching Eggman's base, with Topaz, for a Chaos Emerald, until she encounters E-70 and has to make an escape.

Rouge the Bat tries to steal a Chaos Emerald.

Tails and Chris discover the third Chaos Emerald in a field and fly for it in the X-Tornado but Eggman and E-51 catch up and trap them, meanwhile Rouge and Topaz launch an attack on Eggman's base.

Sonic, Tails, Amy, Chris and another Chris' classmate Frances discover another Chaos Emerald.

Sonic saves Tails and Chris from E-51 while Eggman makes off with the Chaos Emerald, at Eggman's base Knuckles appears and helps Rouge plant explosives but they end up trapped.

Rouge, Topaz and the army are trying to find the generator room of Eggman's fortress.

When Sonic ignores the President's party to take Helen, a wheelchair-bound girl, to pick a flower, the President's aide responds by sending a unit to capture Sonic but Sonic outruns them all giving Helen the thrill of her life and ending up at the party.

Sonic is invited to a party by the President.

Eggman reveals his new secret base, the Egg Fort, and attacks Station Square but Sonic hops in the X-Tornado and forces the Egg Fort out into the ocean where he sinks it into the water.

Eggman creates a battleship to destroy Station Square.

Sonic and Friends retrieve the fourth Emerald from a sunken ship, Eggman returns with his Egg Fort and attacks but Sonic uses a ring from Tails to destroy the robot with a Spin Attack.

Sonic and company are on vacation.

After Hawk shows Knuckles the fifth Chaos Emerald Eggman's E-91 kidnaps Hawk for ransom, but during the trade Rouge enters and Chaos Emerald-keep away ensues until Knuckles defeats the robot, gets the Emerald, and receives a mysterious message from Tikal.

knuckles tries to get the Red Chaos Emerald.

When Sonic, Tails, Chris and the Egg Fort crash land on the Nature Continent after a fight, Tails and Chris protest against a dam while Sonic is caught in a battle against Decoe, Bocoe, E-65 and Eggman, until Tails arrives with a ring.

Sonic tries to fix the X-Tornado.

Sonic begins his adventures in a new world.

Sonic gets in the middle of a movie set.

Sonic and Co. are on a cruise when the Egg Fort appears inside a glacier. Sonic is unable to defeat three E-28 robots, until Knuckles arrives and together they smash the bots and the glacier, but the new Egg Fort 2 emerges from the ice and flies away.

Sonic faces his fear of water.

Sonic begins his adventures in a new world.

Sonic races Chris' uncle.

While Chris & Co. are looking for Cheese who is lost amongst multiple Chao, Eggman spots them, thinking they found another Emerald, unleashes E-66 but E-66 almost kills the Chao until Sonic defeats E-66 and rescues the Chao from environmental destruction.

Sonic and co. find a Chao colony.

When Chris' dad buys a Chaos Emerald for a gift, Sonic and Friends, and Eggman duke it out for the emerald but Eggman unleashes Weazo and escapes with the sixth emerald while Knuckles helps Sonic defeat the robot.

Nelson inadvertly buys the Purple Chaos Emerald.

When Sonic goes berserk and can't stop running, Chris and Chuck discover that it's Eggman's E-88 behind Sonic's problem, but when Amy tries to stop it herself, she winds up in danger and it's Sonic to the rescue again.

Sonic accidentally gets a microchip stuck in his ear.

To return home, Knuckles calls a truce with Eggman and convinces Chris to give up all their Chaos Emeralds, but Eggman betrays them and keeps all six emeralds for himself, with the seventh emerald in the hands of his robot, Lucky.

Only one Chaos Emerald is left to find.

When Sonic and the seventh emerald are knocked into the water after a fight with Eggman's Chaos Emerald-powered robot , Chris steals Eggman's emeralds and drops them into the water, causing Chaos Control and a mysterious island to appear.

As Chaos Control builds, Sonic must battle the Eggsterminator to save Chris.