Sonic X

Sonic X is a Japanese anime television series based on Sega's Sonic the Hedgehog video game series. Produced by TMS Entertainment under partnership with Sega and Sonic Team, and directed by Hajime Kamegaki, Sonic X initially ran for 52 episodes, broadcasting on TV Tokyo from April 2003 to March 2004. A further 26 episodes aired in North America, Europe, and the Middle East from 2005 to 2006. The American localization and broadcasting were handled by 4Kids Entertainment, which edited it and created new music.

The series follows Sonic the Hedgehog and his anthropomorphic friends that accidentally teleport from their home planet to Earth after attempting to save one of their friends from Sonic's nemesis Doctor Eggman. Separated, Sonic is saved by a human boy named Chris Thorndyke, who helps him find his friends while repeatedly scuffling with Doctor Eggman and his robots over control of the powerful Chaos Emeralds, and becoming celebrities. The final story arc sees Sonic and his friends return with Chris to their world, where they enter outer space with a newfound plant-like creature named Cosmo and fight an army of aliens called the Metarex.

Sonic X received mixed reviews. Generally, reviewers criticized its American localization and the human characters, but praised its story and animation. The series was popular in the United States and France, though less so in its native Japan. The show's merchandise included an edutainment video game for the Leapster, a trading card game, a comic book series featuring an original storyline, and various toys and other items.

Following a battle between Sonic the Hedgehog and Doctor Ivo "Eggman" Robotnik, a freak accident involving the seven Chaos Emeralds causes them to create "Chaos Control"—a powerful space-time force that causes both of them, along with Miles "Tails" Prower, Amy Rose, Cream the Rabbit and her pet Chao Cheese, Knuckles the Echidna, and Rouge the Bat, to be transported to a parallel universe containing Earth. Sonic and his friends find themselves landing in the city of Station Square, where they befriend twelve-year-old Christopher "Chris" Thorndyke—a lonely young boy, whose parents, movie-star mother Lindsey, and corporate executive father Nelson, tend to be absent with work, leaving him to be looked after by his grandfather Chuck, maid and chef Ella, and butler Mr. Tanaka.

Seeking to find the Chaos Emeralds in order to go home, the group battle against Eggman as he re-establishes himself on the planet in order to conquer it—aided by his bumbling robotic assistants Becoe and Decoe, and his robotic courier Bokkun—with Rouge joining forces with the local government as a spy in order to help them defend against his attacks. In the course of battling Eggman, Sonic and the others befriend Chris' friends Danny, Frances and Helen, while slowly becoming celebrities thanks to their exploits, eventually being accepted amongst the human population, despite reservations of what might happen when the seven Chaos Emeralds are found.

Six months after the Chaos Emeralds are found and used by Sonic in his Super Sonic form, Chaos Control causes parts of their world to appear on Earth, including Angel Island and the Master Emerald, along with the arrival of Big the Cat and his pet Froggy. Whilst the group adapt to this and carry on with their lives, the government works to establish better defences in anticipation of another attack by Eggman, including the creation of a robotic army to counter the evil scientist's own creations. Much of the first half of this season is focused on adaptations of both Sonic Adventure and Sonic Adventure 2. After Station Square is rebuilt following the attack by Chaos, and Sonic and Shadow prevent Space Colony ARK from crashing into Earth, another Chaos Control event brings several inhabitants of Sonic's world to the planet, including the Chaotix Detective Agency—Vector the Crocodile, Espio the Chameleon, and Charmy Bee—and Vanilla, Cream's mother.

Eggman launches further schemes following the ARK incident, even when briefly captured by the government, whilst Sonic and his friends provide shelter for a robot named Emerl, who later goes on the rampage after coming into possession of a Chaos Emerald and forcing Cream to stop it (the story arc being a loose adaption of Sonic Battle). Eventually, after Eggman is thwarted from another world conquering scheme, the government learns that Earth and Sonic's world are slowly merging together, threatening to end time for them. As a result, Sonic, Eggman, and the others are forced to return home to prevent this, with Chris having to bravely allow his new friends to go, but with hope of seeing them again.

Six months after returning home, Sonic and his friends find themselves battling a new threat in the form of the Metarex—a race of villainous robots who seek to conquer the galaxy—aided by Cosmo, an antromorphic plant girl, who seeks to stop them. At the same time on Earth, where six years have passed, Chris finishes completing a portal device to take him to Sonic, arriving in his world to assist with his new found knowledge, despite the differences in time between the two worlds causing his body to revert back to that of his 12 year-old self. Departing their world, the group explore the galaxy for the Chaos Emeralds, after Sonic had to disperse them to avoid them being used by the Metarex. Alongside the group, Eggman also pursues after the Emeralds, accompanied by Rouge, and aided by Shadow, whom he had recovered following his supposed demise.