Sonic X
During a mission on Mobius to rescue Cream the Rabbit and Cheese the Chao from Dr. Eggman's headquarters, Sonic and his friends are caught in an explosion that transports them to another dimension occupied by humans.
Pure Chaos
When Big the Cat and Froggy discover a Chaos Emerald, a strange blue liquid takes over Froggy's body and runs away with the Chaos Emerald. Meanwhile, Lindsey offers Cream with another Chaos Emerald that she had obtained from a jeweler.
A Chaotic Day
Knuckles recalls how Chaos destroyed the Master Emerald. Suspecting that Chaos is controlling Froggy, the gang decide to head their own ways in search of rescuing Froggy and recovering the Chaos Emerald.
A Robot Revels
As Knuckles blames himself for not being able to guard the Master Emerald, Sonic and Tails take off in the X-Tornado to save Amy from the Egg Carrier.
Heads Up, Tails
Sonic, Tails and Knuckles battle Dr. Eggman on the Egg Carrier to save Amy and for the last piece of Master Emerald. Meanwhile, Chris and Big are still in search of Froggy.
Revenge of the Robot
As Tails is given a hero's welcome after saving Station Square from Eggman's missile attack, Gamma decides to deprogram the mission given to him by Dr. Eggman and assigns himself a new one…
Flood Fight
Dr. Eggman reveals to Sonic that he had been double-crossed by Chaos. As Knuckles warns Sonic of dangers of Chaos if he was to obtain the last Chaos Emerald, they are transported to the past by a mysterious red orb.
Project: Shadow
As he hacks GUN's computer database, Dr. Eggman discovers his grandfather's mysterious "Ultimate Life Form" project named Shadow.
Shadow Knows
Sonic is accused of causing havoc in Prison Island. As GUN agents seek after Sonic, Sonic attempts to figure out who had framed him.
Sonic's Big Break
While Sonic is held captive in Prison Island, Dr. Eggman appears in search for Chaos Emerald alongside Rouge and Shadow.
Shadow World
After the destruction of Prison Island, Sonic searches for Chris whom Amy suspects was taken to Dr. Eggman's secret base by Shadow.
Robotnik's Revenge
Sonic and Shadow face off while the rest of the crew seek Dr. Eggman who is now in posession of seven Chaos Emeralds. As the battle unfolds, Knuckles take on Rouge for the control of the Master Emerald.
Showdown in Space
To complete his final revenge, Dr. Robotnik's revenge was to crash ARK into earth, destroying everything and everyone. Sonic must now convince Shadow to help save the world from destruction.
Defective Detective
Sonic's world and its creatures called Flickies begin to appear in Chris' world. As the President and his staff discuss how to keep them isolated; Chris worries about what they might do with Sonic.
Sunblock Solution
Sonic and friends readies to ring in the new year on the Thorndyke yacht. As the first sun begins to rise, Egg Moon appears to block the year's first sunrise.
Eggman for President
As the President sends in GUN forces to stop Sonic from destroying the Mirror Towers, Dr. Eggman reveals that his Sunshine Balls are secretly brainwashing the citizens to turn against Sonic.
A Date to Forget
When Sonic stands Amy up on a date she decides to go out with Sam Speed instead. Meanwhile, Bokkun reactivates a robot named Emerl to free Eggman from jail.
Mean Machines
As Nelson tries to maintain the faltering Thorndyke Industries due to his employees joining the Freedom Movement to emulate Sonic's carefree lifestyle, kitchen appliances begin to cause havoc around town.
Sewer Search
Eggman is on the loose and everyone is searching for him. While Mr. Stewart investigates Eggman's whereabouts, he is captured along with Chris in Eggman's secret hideout in the sewers.
Prize Fights
The President hosts a tournament with the red Chaos Emerald as the prize to lure Dr. Eggman. It's a heated battle that finds Sonic fighting alongside everyone, even the President himself…
A Wild Win
The battle for the red Chaos Emerald is heating up. As contestants duke it out for the glory and the prize it's Emerl who wins the tournament. But when Emerl receives the emerald, its power forces him to go on a rampage.
Map of Mayhem
When Dr. Eggman learns that Knuckles has just discovered the oldest map in the world, which holds the location of the lost continent of Murasia, he sends Decoe and Bocoe on a mission to take the map away from Knuckles.
The Volcanic Venture
Sonic and his friends are in pursuit of Dr. Eggman, who has fled into the volcano which lies at the world's bellybutton. They come upon the Murasians ruin which attributed its destruction to a supposed dragon god.
The Beginning of the End
Dr. Bickley discovers that Sonic's world and theirs were once one and the same. As the two world slowly completes its reunification, she realizes that the process would ultimately cause time to stop…
Running Out of Time
As Chris spends his last day with Sonic while they prepare for their trip home, the President's army colonel decides to act on his own to capture Dr. Eggman.
Friends 'Til the End
Chris is unable to come to terms with the idea of parting with Sonic and decides to run away with Sonic. As the time runs short for Chaos Control to send Sonic back to his world before the two worlds merge…
A New Start
With everyone back in their home worlds the crisis has been averted and all seems to be back to normal. Except, no one seems to know where Sonic is. His friends and even Eggman begin to wonder where he might be.
