 Season 3 · France and 4Kids TV 2005–2006 · Japan 2020 | |
| Series | Sonic X (ソニックX), TMS Entertainment, 2003–2006 |
| Season | Season 3 of 3 · 26 episodes (nos. 53–78) · the Metarex Saga |
| France | First broadcast 12 March – 18 April 2005 (per Wikipedia’s episode list) |
| United States | 4Kids TV on Fox · 10 September 2005 – 6 May 2006 |
| Japan | Not shown on TV at the time (rental and streaming only); Kids Station, 25 March – 30 April 2020 |
| English version | 4Kids Entertainment |
| Series director | Hajime Kamegaki |
| Writers | Kiyoko Yoshimura (12 episodes), Hiro Masaki, Masahiko Shiraishi, Yoshio Urasawa |
| Japanese themes | “Sonic Drive” (opening) · “Hikaru Michi” (ending) |
| Previous season | Season 2 (episodes 27–52) |
Six months after Sonic’s return home – and six years after Chris last saw him – Sonic X leaves Earth behind for a space opera. The Metarex, an army of robots led by the mysterious Dark Oak, are stealing the Planet Eggs that keep worlds alive, and a gentle plant-like girl named Cosmo, whose home the Metarex destroyed, falls from the sky to ask Sonic for help.
So Tails builds a starship, the Blue Typhoon, Chris builds a portal and arrives twelve years old again, and the crew sets off across the galaxy to recover the scattered Chaos Emeralds. Eggman, Rouge and a resurrected Shadow follow in the Crimson Egg with their own agenda, and the Chaotix keep turning up for comic relief. Underneath the planet-of-the-week adventures runs a slow-burning story – Tails and Cosmo’s friendship, Cosmo’s secret, and Shadow’s return – that ends in what Nintendo Life called an “emotional finale”.
This season has an unusual history. It was never shown on Japanese TV at the time: French viewers saw it first in spring 2005, 4Kids TV in the US from September 2005, and Japan only in 2020, when Kids Station aired it to tie in with the Sonic the Hedgehog film.
- 26episodes, the Metarex Saga
- 3countries’ premieres spread over 15 years: France 2005, US 2005–2006, Japan 2020
- 12scripts by Kiyoko Yoshimura, including the last three
- 4Metarex commanders: Pale Bayleaf, Black Narcissus, Yellow Zelkova and Red Pine
- 2endings for Shadow: presumed dead in the 4Kids dub, alive in the Japanese version of the finale
Quick Answers
How many episodes are in Sonic X Season 3?
Twenty-six: episodes 53 to 78, the end of the series. Japanese sources call them “Series 2”, after the 52-episode “Series 1” that aired on TV Tokyo; 4Kids called them Season 3. On US DVD they were split into The Complete 5th Season (53–65) and So Long, Sonic (66–78), so you may also see them counted as seasons 5 and 6.
Did Season 3 air in Japan?
Not at the time. The episodes were made and offered through rental and streaming services, but TV Tokyo never broadcast them, and they were not released on Japanese DVD. Japanese TV finally showed them on Kids Station from 25 March to 30 April 2020, as part of the promotion for the Sonic the Hedgehog film.
Where did it premiere?
France, from 12 March 2005 according to Wikipedia’s episode list, ahead of the US premiere on 4Kids TV on 10 September 2005. The US run paused for two months after episode 65 and ended on 6 May 2006.
Who is Cosmo?
A plant-like girl from a world the Metarex destroyed, who joins the Blue Typhoon’s crew and becomes close to Tails. See the cast on the series page.
Where can I watch Season 3?
The full English dub is on TMS Entertainment’s official Anime! on TMS YouTube channel, embedded on each of our episode pages; Discotek Media’s Sonic X Collection 2 DVDs and the complete-series Blu-rays have it too, and the 2023 Blu-ray includes the Japanese version with subtitles.
Season 3 at a Glance
A call from space (episodes 53–59)
The Metarex attack, Cosmo arrives, Chris crosses over and the Blue Typhoon launches. Early stops include a drowned water world, an ice planet and a jungle planet, with Eggman shadowing the heroes and the Chaotix flying out supplies from Earth.
Cosmo arrivesA Cosmic Call
The crew assemblesCosmic Crisis
The jungle searchDesperately Seeking Sonic
Shadow and the Emerald race (episodes 60–67)
Rouge finds Shadow alive in a capsule aboard the Crimson Egg, Eggman and Sonic team up to raid a Metarex fortress, and the four Metarex commanders – Red Pine, Yellow Zelkova, Black Narcissus and Pale Bayleaf – start to take the heroes seriously.
Shadow returnsTrick Sand
Tails and CosmoAn Underground Odyssey
Yellow ZelkovaClash in the Cloister
Allies and traitors (episodes 68–74)
Shadow helps a rebel girl on a ruined planet, Eggman joins the Metarex, the Chaotix open a café, and Shadow boards the Blue Typhoon to kill Cosmo – because, it turns out, the Metarex have been seeing through her eyes all along.
Shadow and MollyA Revolutionary Tale
Eggman and Black NarcissusTerror on the Typhoon
Tails protects CosmoThe Cosmo Conspiracy
The final battle (episodes 75–78)
A thousand-year prophecy, the Final Mova, Super Sonic and Super Shadow, Cosmo’s sacrifice – and a one-way ticket home for Chris.
Black NarcissusAgent of Mischief
Super Sonic and Super ShadowA Fearless Friend
Chris and KnucklesSo Long Sonic
Episode Guide
All 26 Season 3 episodes in broadcast order, numbered within the season and overall. English (4Kids) title first, then the Japanese title and its translation. Dates are the US premiere on 4Kids TV and the first Japanese TV broadcast in 2020; each episode page also gives the French premiere.
| # | Episode | First aired | In short | |
|---|---|---|---|---|
 | 1no. 53 overall | A Cosmic CallJapan: “The Messenger from a Meteor Shower” 流星雨の使者 | US 10 Sep 2005 JP TV 25 Mar 2020 | Six months after coming home, Sonic faces the Metarex and their leader Dark Oak – and a plant-like girl named Cosmo falls from the sky. · Season premiere Episode guide → |
| 2no. 54 overall | Cosmic CrisisJapan: “The Spaceship Blue Typhoon” 宇宙船ブルータイフーン号 | US 17 Sep 2005 JP TV 26 Mar 2020 | Cosmo explains the Metarex threat, and Tails readies the starship Blue Typhoon – complete with a cannon that fires Sonic. Episode guide → |
 | 3no. 55 overall | H2 WhoaJapan: “The Water Planet Hydo” 水の惑星ハイドー | US 24 Sep 2005 JP TV 27 Mar 2020 | The Blue Typhoon’s first stop is a planet drowned since its Planet Egg was taken – and the Metarex capture Sonic. Episode guide → |
 | 4no. 56 overall | An Enemy in NeedJapan: “Dr. Eggman Joins the War!” Ｄｒ．エッグマン参戦！ | US 1 Oct 2005 JP TV 31 Mar 2020 | Eggman spins Knuckles a tale about going straight to get his hands on a Chaos Emerald – until a frog-shaped Metarex snatches the prize. Episode guide → |
 | 5no. 57 overall | A Chilling DiscoveryJapan: “The Battle on the Ice Palace” アイスパレスの戦い | US 8 Oct 2005 JP TV 1 Apr 2020 | On a frozen world, the heroes fight through the Metarex to an Ice Palace where a Chaos Emerald lies sealed in ice. Episode guide → |
| 6no. 58 overall | Desperately Seeking SonicJapan: “The Maidens’ Jungle Trap” 乙女のジャングルトラップ | US 15 Oct 2005 JP TV 2 Apr 2020 | Sonic is blasted away on a jungle planet, and Amy, Cosmo and Cream set off to find him – and the stolen Planet Egg. Episode guide → |
 | 7no. 59 overall | Galactic GumshoesJapan: “Go into Space, Chaotix” カオティクス、宇宙へ行く | US 22 Oct 2005 JP TV 3 Apr 2020 | The Chaotix fly supplies from Earth out to the Blue Typhoon – and get a less than warm welcome. Episode guide → |
| 8no. 60 overall | Trick SandJapan: “Shadow Rebirth” シャドウ・リバース | US 29 Oct 2005 JP TV 6 Apr 2020 | On a dead planet, the ruins turn out to be a shape-shifting Metarex – and Shadow, found in a capsule by Rouge, returns. Episode guide → |
 | 9no. 61 overall | Ship of DoomJapan: “Metarex Battleship Attack!” メタレックス戦艦襲来！ | US 5 Nov 2005 JP TV 7 Apr 2020 | The Metarex warship that once destroyed Cosmo’s ship attacks the Crimson Egg, then the Blue Typhoon. Episode guide → |
| 10no. 62 overall | An Underground OdysseyJapan: “Secret of the Underground Valley” 地下渓谷の秘密 | US 12 Nov 2005 JP TV 8 Apr 2020 | Separated from the others, Tails and Cosmo discover a Metarex factory turning out fake Chaos Emeralds. Episode guide → |
 | 11no. 63 overall | Station Break-InJapan: “Space Fortress Metal Plant” 宇宙要塞メタルプラント | US 19 Nov 2005 JP TV 9 Apr 2020 | The last two Emeralds are inside a Metarex fortress, so Eggman proposes a truce with Sonic to break in. Episode guide → |
 | 12no. 64 overall | A Metarex MeleeJapan: “Clash! Sonic vs Shadow” 激突！ソニックｖｓシャドウ | US 26 Nov 2005 JP TV 10 Apr 2020 | Trapped in the fortress by Dark Oak’s army, Sonic faces Shadow over the Chaos Emeralds. Episode guide → |
 | 13no. 65 overall | Mission: Match-UpJapan: “The Chaotix’s Big Shocking Love-Love Mission” カオティクス電撃ラブラブ大作戦 | US 3 Dec 2005 JP TV 13 Apr 2020 | The stranded Chaotix board the Blue Typhoon, and Vector decides Tails needs help with his feelings for Cosmo. Episode guide → |
| 14no. 66 overall | Clash in the CloisterJapan: “Crossing the Galaxy Corridor!” 銀河回廊をわたれ！ | US 4 Feb 2006 JP TV 14 Apr 2020 | The Blue Typhoon takes a risky shortcut through a galactic corridor, and Yellow Zelkova attacks. Episode guide → |
 | 15no. 67 overall | Testing TimeJapan: “Black Trap” ブラック・トラップ | US 11 Feb 2006 JP TV 15 Apr 2020 | Black Narcissus lures the Blue Typhoon to an asteroid factory to test Sonic – and pushes him into a dark new form. Episode guide → |
| 16no. 68 overall | A Revolutionary TaleJapan: “On a Destroyed Planet” こわれた星の上で | US 18 Feb 2006 JP TV 16 Apr 2020 | Shadow, Rouge and Eggman land on the ravaged planet Cascade, where a young rebel named Molly fights the Metarex. Episode guide → |
 | 17no. 69 overall | The Planet of MisfortuneJapan: “Please Marmolin!” お願いマルモリン！ | US 25 Feb 2006 JP TV 17 Apr 2020 | Three tiny Marmolims with a Chaos Emerald hitch a ride, and the crew must take them home to their planet of magic. Episode guide → |
| 18no. 70 overall | Terror on the TyphoonJapan: “The Eggman Fleet Appears!” エッグマン艦隊現る！ | US 4 Mar 2006 JP TV 20 Apr 2020 | Sonic rescues a small ship from the Metarex – only to find Decoe at the controls, and Eggman on the enemy’s side. Episode guide → |
 | 19no. 71 overall | Hedgehog HuntJapan: “Cafe Chaotix” カフェ・カオティクス | US 11 Mar 2006 JP TV 21 Apr 2020 | The Chaotix are running a café on a faraway planet when Eggman turns up – as one of the Metarex commanders. Episode guide → |
 | 20no. 72 overall | Zelkova Strikes BackJapan: “The True Form of the Metarex!?” メタレックスの正体！？ | US 18 Mar 2006 JP TV 22 Apr 2020 | Yellow Zelkova, shielded by Eggman’s technology, forces the Blue Typhoon down on a fiery planet. Episode guide → |
| 21no. 73 overall | The Cosmo ConspiracyJapan: “Assassin Shadow!” 暗殺者シャドウ！ | US 1 Apr 2006 JP TV 23 Apr 2020 | Shadow boards the Blue Typhoon to kill Cosmo, and Tails stands between them. Episode guide → |
 | 22no. 74 overall | Eye SpyJapan: “Lost Planet” ロスト・プラネット | US 8 Apr 2006 JP TV 24 Apr 2020 | The crew learns that Dark Oak has been spying through Cosmo – and that a deserted world was once her home. Episode guide → |
| 23no. 75 overall | Agent of MischiefJapan: “The Day of the Plantations” 森化の日 | US 15 Apr 2006 JP TV 27 Apr 2020 | Eggman sends word of a thousand-year prophecy, and the Blue Typhoon heads for the final battle at coordinates 000. Episode guide → |
 | 24no. 76 overall | The Light in the DarknessJapan: “Showdown! Dark Oak” 決戦！ダーク・オーク | US 22 Apr 2006 JP TV 28 Apr 2020 | With Sonic trapped inside the planet Aquarius, the crew fires the Master Emerald’s power at the Final Mova – and Amy dives in after Sonic. Episode guide → |
| 25no. 77 overall | A Fearless FriendJapan: “I Can Do It for Your Sake” 君のためにできること | US 29 Apr 2006 JP TV 29 Apr 2020 | The Final Mova becomes a giant seed; Cosmo’s sacrifice and Super Sonic and Super Shadow end the Metarex. Episode guide → |
| 26no. 78 overall | So Long SonicJapan: “The Place Where Planets Are Born” 星の生まれるところ | US 6 May 2006 JP TV 30 Apr 2020 | The war is over and Cosmo is gone; Chris must find a way home, and the series ends with a new beginning. · Series finale Episode guide → |
Cosmo, the Metarex & Other New Faces
Season 3’s new cast is almost entirely the anime’s own. Voices are Japanese / 4Kids English.
CosmoA plant-like girl whose home was destroyed by the Metarex. She joins the Blue Typhoon to stop them and becomes Tails’ closest friend.Voice: Etsuko Kozakura / Amy Birnbaum
Dark OakThe Metarex leader, whose true identity is bound up with Cosmo’s own people.Voice: Jōji Nakata / Matt Hoverman
Pale BayleafOne of the four commanders, part of the Final Mova in the end.Voice: Jūrōta Kosugi / Marc Diraison (Wikipedia)
Black NarcissusThe commander who experiments on Sonic in “Testing Time”.Voice: Ken Narita / David Wills
Yellow ZelkovaThe heavyweight of the four, armed with an Eggman-built shield in “Zelkova Strikes Back”.Voice: Takeshi Watabe / Ted Lewis
Red PineThe commander whose fleet traps the heroes at the Metarex fortress.Voice: Hōchū Ōtsuka / Jonathan Todd Ross (Wikipedia)
MollyA resistance pilot on the planet Cascade who idolises Shadow.Voice: Sachiko Kojima
The Blue TyphoonTails’ starship, armed with the Sonic Driver – a cannon that fires Sonic.
Character art via Sonic Wiki Zone. Voice credits from Anime News Network and Wikipedia; see the series page for the full casts.
Japan vs 4Kids: Season 3 Dub Differences
- Names. Several planets, ships and weapons have different names in the two versions: the water world Hydo is Secco in the dub, the ice planet Breezer is Breezy, the warship Hellship is Scarship, the Blue Typhoon’s Sonic Driver is the Sonic Power Cannon, and the galactic corridor becomes the “Intergalactic Cloister”.
- Titles and music were replaced as in the earlier seasons; the Japanese version kept “Sonic Drive” and brought back “Hikaru Michi” as its ending.
- Content edits follow the same Fox standards as in the earlier seasons.
- The finale. The 4Kids version of “So Long Sonic” drops almost four minutes of opening scenes and leaves Shadow presumed dead; only the Japanese (and French) version shows him alive near the end, laying a rose on Molly’s grave.
- Air order. Unusually, the English-speaking world saw these episodes before Japanese TV did – by almost fifteen years.
Sources: Wikipedia (Japanese-version names in its episode list and character list) compared with 4Kids’ official English episode descriptions as used on TMS’s YouTube uploads and Sonic Wiki Zone. The finale changes come from Sonic Wiki Zone’s “So Long Sonic” and “Shadow the Hedgehog (Sonic X)” pages; other scene-level edits listed only by fan wikis are not repeated here.
Home Video & Streaming
| Release | Label & date | Season 3 episodes |
|---|---|---|
| Sonic X: The Complete 5th Season | 4Kids / FUNimation, September/October 2006 | 53–65 |
| Sonic X: So Long, Sonic | 4Kids / FUNimation, 13 February 2007 | 66–78 |
| Sonic X Collection 2 (4 DVDs) | Discotek Media, 6 December 2016 | 53–78 |
| Sonic X: The Complete Series Blu-ray (English) | Discotek, 28 May 2019 | All 78 |
| Sonic X: The Complete Series Blu-ray (Japanese, subtitled) | Discotek, 25 April 2023 | All 78 |
There was no Japanese DVD release of these episodes. Streaming: the English dub is on the Anime! on TMS YouTube channel (checked 6 November 2026).
Trivia
- Grosset & Dunlap’s six Sonic X novels (2005–2007) take their titles from the first six episodes of this season.
- Kiyoko Yoshimura, who wrote the season premiere, also wrote its last three episodes.
- Series director Hajime Kamegaki directed and storyboarded two episodes this season, “Testing Time” (67) and the finale (78), as he had episodes 1, 26 and 52.
- “A Revolutionary Tale” is the only episode of the season without Sonic and his friends, according to Wikipedia’s episode list.
Sources
Facts on this page were checked against these sources in November 2026. Where they disagree we say so.
- Luke’s original Sonic X episode table, Sonic Scene (2017; Joomla article 470).
- Wikipedia: List of Sonic X episodes – titles, credits, French, US and 2020 Japanese dates, home video.
- Wikipedia: Sonic X – broadcast history, characters (with its cited sources).
- Sonic Wiki Zone episode pages – plot notes, title cards and screenshots; “So Long Sonic” and “Shadow the Hedgehog (Sonic X)” for the finale’s Japanese and English differences.
- Anime News Network encyclopedia: Sonic X – casts.
- Anime! on TMS Official Channel (YouTube) – official English episodes and 4Kids episode descriptions.
Part of our Sonic X guide: see the series page for the show’s history, the Japanese and English casts, the theme songs and home video.