Sonic X is an anime series that is adapted from the Sonic the Hedgehog video game series. It was produced in Japan by TMS Entertainment with the partnership of Sonic Team. So far, these are the only TV appearances of Amy Rose, Cream the Rabbit, Shadow the Hedgehog, and Rouge the Bat.

Plot synopsis : Series 1

---

During on Mobius a mission 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 what seems to be another dimension. While Sonic is exploring this new place, he meets with a man named Sam Speed. Sam and his team, called The S Team, chase after Sonic because he looks so strange. The S Team fails at catching Sonic, but Sonic falls into a swimming pool. Luckily, he is saved from drowning by a twelve year old boy named Christopher Thorndyke. Chris lives in a mansion owned by his two celebrity parents with his inventor grandfather. Chris aids Sonic in locating his friends, and it is not long before Dr. Eggman reappears. Sonic and Eggman race to collect all the Chaos Emeralds in the first 26 episodes and eventually, all of the Chaos Emeralds are retrieved and Chaos Control warped parts of their home to Earth (like Angel Island). In the end, Chris' grandfather invents a portal to send Sonic back to where he came from. Before he leaves, Chris shuts down the portal leading to Sonic's world because he does not want Sonic to go home, but eventually, Chris comes to terms with his feelings and Sonic returns to his own dimension.

At the beginning of the first season, when Sonic and his friends are transported to Chris's world and they get into trouble with the police and hide in Chris's house, where only Chris, his grandfather, and their maid, Ella, and their butler, Tanaka, know of their existence. Eventually, however, they are accepted as heroes and celebrities, with the entire city knowing about them. The second season features plots based on Sonic Adventure, Sonic Adventure 2, and Sonic Battle.


Plot synopsis: Series 2

---

It has been 6 years since Sonic and friends returned to their dimension. Chris is now eighteen and has been working on repairing his grandfather's dimensional portal. A plant being named Cosmo arrives on Sonic's planet, looking for the one who can wield the powers of the Chaos Emeralds. Sonic, having been nearly defeated by a new enemy called Dark Oak, scatters the Chaos Emeralds across the galaxy to prevent Dark Oak from using their power. When Chris uses the portal, he suddenly finds himself in Sonic's world. His age has reversed back to the age when he met Sonic. However, Chris still has all his memories of the years since. To Sonic, only six months had passed. During their reunion, Dark Oak and his Metarex army (similar to the Black Arms from the Sonic games) attacks and steal the "Planet Egg" from Sonic's planet. Without the Egg, all the plants on the planet wither. Once again, Sonic and friends venture into space to retrieve the Chaos Emeralds. After many run-ins with Dr. Eggman and the pursuing Metarex, Cosmo is eventually unveiled as an unwilling spy for the Metarex, who are part of the same race of anthropomorphic plants that Cosmo from. When the Metarex enact a plan that could destroy the universe, Cosmo sacrifices herself with the help of Super Sonic and Super Shadow, and her essence is manifested in the form of a seed. With Metarex destroyed, Eggman helps Chris to be sent back home. Soon thereafter, Dr. Eggman revives his previous rivalry with Sonic, albeit a light-hearted one. The series ends with numerous cliffhangers, such as the whereabouts of Chris and Shadow and what happened to the seed that Cosmo gave Tails.

American version:

---

In 2003, 4Kids Entertainment and VIZ Media co-licensed Sonic X for the United States, with the series being distributed and licensed on DVD by FUNimation, Alliance Films (Canada) and Paramount Home Entertainment (UK). The episodes were then localized for the intended demographic, including the complete replacement of the score, as well as removing suggestive content and changing the fate of several characters, as well as editing the story to be much lighter and younger in tone for US Release. Other continuity errors include mislabelling "Chaos Control" as Doctor Eggman's base. While both English and Japanese characters were digitally removed or replaced with incoherent symbols, Chinese characters were unedited in The Adventures of Knuckles and Hawk, in coherence with the episode's setting.

4Kids did not cast the voice actors from the Sonic games and went with their in-house VAs. Mike Pollock, the current voice actor for Doctor Eggman, stated during an interview that he was provided samples of the game's voice overs as a reference. The original 4Kids cast included Jason Griffith (as Sonic and Shadow), Lisa Ortiz (as Amy), Amy Palant (as Tails), Dan Green (as Knuckles), Rebecca Handler (as Cream), and Mike Pollock (as Dr. Eggman).

Many people panned the American version for being poorly dubbed while some criticized it for editing the dialogue and changing the music to be more "suitable for kids". In episode 52 (A New Start), when characters Amy and Sonic reunite, the dialogue was changed in a way that removed any signs of them being more than friends, along with removing the sign that stated "Home of Amy Rose". Because of these and many other edits, the Sonic X fanbase have said that the original Japanese version is far superior to the English version.

When a producer for the series was asked about any prior experience with the Sonic franchise, he replied, "I've never played the game, seen the series or read the comics."

As of August 2009, 4Kids Entertainment still owns the North American rights to Sonic X. The edited dub airs on The CW4Kids in reruns, and the entire series can be viewed online at 4KidsTV.com, as well as the first 26 episodes on YouTube Shows. However, in July 2009, 4Kids uploaded a preview for a subtitled episode of the Japanese version of Sonic X. A representative on 4Kids' YouTube Channel says more episodes are coming, including the complete first season.