List of Sonic X episodes

Sonic X (Japanese: ソニックX, Hepburn: Sonikku Ekkusu) is a Japanese anime television series. It is based on Sega's Sonic the Hedgehog video game franchise.

Series overview

Season		Episodes		Originally aired
				First aired	Last aired
	1	26		April 6, 2003 (2003-04-06)	September 28, 2003 (2003-09-28)
	2	26		October 5, 2003 (2003-10-05)	March 28, 2004 (2004-03-28)
	3	26		September 10, 2005 (2005-09-10)	May 6, 2006 (2006-05-06)

Episode list

Season 1: The New World and Chaos Emerald Sagas (2003–04)

No.	Title (English dub title)	Directed by	Written by	Storyboarded by	Original air date	American air date
1	"Super Sonic Hero Appears!" ("Chaos Control Freaks") Transcription: "Chōonsoku hīrō tōjō!" (Japanese: 超音速ヒーロー登場！)	Hajime Kamegaki	Hiro Masaki	Hajime Kamegaki	April 6, 2003 (2003-04-06)	August 23, 2003 September 6, 2003
At the end of the battle for the Chaos Emeralds with Dr. Eggman, Sonic crosses time and space and ends up in the human world. He is rescued by a boy named Chris Thorndyke.
2	"Infiltrate! Area 99" ("Sonic to the Rescue") Transcription: "Sennyū! Eria 99" (Japanese: 潜入！エリア９９)	Keiichirō Furuya	Hiro Masaki	Kazuhide Tomonaga	April 13, 2003 (2003-04-13)	September 13, 2003
Sonic learns that his friends Cream and Cheese are captured in a military research facility named Area 99. Sonic successfully sneaks in there, but the rescue operation gets a lot more dangerous. It is then that Tails arrives and joins the group.
3	"Dr. Eggman's Ambition" ("Missile Wrist Rampage") Transcription: "Dr. Egguman no yabō" (Japanese: Ｄｒ．エッグマンの野望)	Keiko Oyamada	Hiro Masaki	Toshihiko Masuda	April 20, 2003 (2003-04-20)	September 20, 2003
Dr. Eggman begins causing problem in the city. He says that he is going to make this world his. Tails and Chris go up against him. Knuckles and Amy make an appearance and join the fight. Amy is captured in the fight.
4	"Get the Chaos Emerald!" ("Chaos Emerald Chaos") Transcription: "Kaosu Emerarudo o te ni irero!" (Japanese: カオスエメラルドを手に入れろ！)	Masafumi Satō	Hiro Masaki	Kazuyoshi Yokota	April 27, 2003 (2003-04-27)	September 27, 2003
The President becomes aware of Sonic's existence. He sees Eggman's scientific power as a threat. An agent (Mr. Stewart) is sent into Chris' school to pose as a teacher. A mysterious stone has been discovered. Eggman and Sonic's group know that the stone is a (green) Chaos Emerald.
5	"Clash! Sonic vs. Knuckles" ("Cracking Knuckles") Transcription: "Gekitotsu!! Sonikku vs Nakkuruzu" (Japanese: 激突！！ソニックｖｓナックルズ)	Keiichirō Furuya	Kiyoko Yoshimura	Kazuhide Tomonaga	May 4, 2003 (2003-05-04)	October 4, 2003
Having parted with Sonic and the others, Knuckles, who is taking independent action, hides in the city. There, he comes in contact with Eggman, who claims that he wants to collect the Chaos Emeralds to return to their own world and apologizes for the evil deeds he has done until now, asking Knuckles to deal with Sonic. Knuckles is tricked by those words. It is then reported that an unidentified gem has been discovered. It turns out to be a trap Eggman had made up, but Knuckles and Sonic's group fall for it. That's where Sonic and Knuckles begin their fight.
6	"Fierce Battle! School Wars" ("Techno-Teacher") Transcription: "Nessen! Sukūru wōzu" (Japanese: 熱戦！スクール・ウォーズ)	Naoyuki Kuzuya	Yoshio Urasawa	Kōji Hōri	May 11, 2003 (2003-05-11)	October 11, 2003
Chris and his classmates go outside the school for an extracurricular lesson. Eggman believes that it is necessary to educate children in order to conquer the world, and sends a robot named E-51 Intelligente to Chris and the others. The robot is highly enthusiastic about teaching, but goes berserk and puts Chris and the others in danger. That's where Sonic rushes in and begins a heroic battle with the robot.
7	"Giant Free-for-All! Chris' House Party" ("Party Hardly") Transcription: "Daikonsen! Kurisu no hōmu pāti" (Japanese: 大混戦！クリスのホームパーティ)	Keiko Oyamada	Chinatsu Hōjō	Toshihiko Masuda	May 18, 2003 (2003-05-18)	October 18, 2003
Chris, learning of his school's teacher Mr. Stewart's (who is actually a spy sent by the President) sudden calls to his home, is in a huge panic as he can't let anybody know about Sonic, Tails, Amy, Cream, or Cheese. Of course, they are not known to anyone other than Chuck yet, so the two try their best to hide the secret from Ella and Tanaka. However, Cream and Cheese end up leaving the room without permission and cause an uproar. Sonic imprisons them for the crime of that thing they do. This is the first episode that does not feature Eggman.
8	"Emergency Launch! X-Tornado" ("Satellite Swindle") Transcription: "Kinkyū hasshin! X Torunēdo" (Japanese: 緊急発進！Ｘトルネード)	Makoto Bessho	Masahiko Shiraishi	Makoto Bessho	May 25, 2003 (2003-05-25)	October 25, 2003
Knowing that he is being monitored by the military, Dr. Eggman uses a new robot (E-90) that ends up swallowing the man-made satellites. Because of this, the surface is in mayhem, with Cream ending up unable to watch the TV program she was enjoying. Sonic goes on to try and solve the issue, but the bi-plane Tornado cannot reach the void of space. That's where Tails and Chuck remodel the Tornado, take Sonic on board, and head on to take down Eggman's robot.
9	"Amy on the Beach" ("The Last Resort") Transcription: "Nagisa no Emī" (Japanese: 渚のエミー)	Keiichirō Furuya	Kiyoko Yoshimura	Kazuhide Tomonaga	June 1, 2003 (2003-06-01)	November 1, 2003
Since Chris is going to attend the opening ceremony of a resort establishment, everyone goes to the villa of Chris' house. However, Sonic decides to run off somewhere else. Amy gazes at the sea, wishing to have come here with Sonic. Then, Dr. Eggman arrives at the ceremony's site and wreaks havoc with his robots intent on building his own amusement park in its place. Sonic, aided by Amy, arrives to save the day and Eggman is defeated by Amy, but ends up falling into the ocean, with Sonic going in to save her despite his aquaphobia.
10	"Fierce Fight! Sonic Baseball Team" ("Unfair Ball") Transcription: "Gekitō! Sonikku yakyūgun" (Japanese: 激闘！ソニック野球軍)	Masafumi Satō	Mutsumi Mikuni	Masafumi Satō	June 8, 2003 (2003-06-08)	November 8, 2003
A (cyan) Chaos Emerald is discovered in a stadium that is set to be demolished. Sonic and the others come running for it without a moment's delay, but of course, Eggman arrives there as well and takes the emerald for himself, staring the group down. It is then when Chuck proposes a fair and square baseball match, with Eggman and Sonic's team commencing a competition for the Chaos Emerald.
11	"The Beautiful and Mysterious Thief Rouge" ("Fly Spy") Transcription: "Utsukushiki kaitō Rūju" (Japanese: 美しき怪盗ルージュ)	Keiko Oyamada	Hiro Masaki	Toshihiko Masuda	June 15, 2003 (2003-06-15)	November 15, 2003
Due to Chaos Control that happened in episode 1, Rouge is warped into this world as well, where she continues to be a jewel thief. Soon after, in order to defeat Dr. Eggman, the office of the President sets up a plan to get Sonic and his friends on their side. Then, they attempt to capture Sonic by making up a hoax about a Chaos Emerald making an appearance. Rouge ends up falling into that trap. The government tells Rouge to become the President's agent, and to infiltrate Dr. Eggman's base. Rouge, however, finds a (cyan) Chaos Emerald inside the base and fights against an Eggman's robot while trying to rob it.
12	"Attack on the Eggman Base! (Part One)" ("Beating Eggman, Part 1") Transcription: "Egguman kichi sōkōgeki! (zenpen)" (Japanese: エッグマン基地 総攻撃！（前編）)	Naoyuki Kuzuya	Hiro Masaki	Naoyuki Kuzuya	June 22, 2003 (2003-06-22)	November 22, 2003
The office of the President is polishing up a plan of attack on Eggman's base. The presidential envoys visit Chris' house and ask for Sonic's help, but their negotiations fail. The government attempts to infiltrate Eggman's base with a special force led by Rouge in the gap they escaped the base from previously. Meanwhile, the battle revolving around the (yellow) Chaos Emerald ensues between Eggman, Tails, and Chris' group. Having learned this, Sonic heads out to Chris' group's assistance.
13	"Attack on the Eggman Base! (Part Two)" ("Beating Eggman, Part 2") Transcription: "Egguman kichi sōkōgeki! (kōhen)" (Japanese: エッグマン基地 総攻撃！（後編）)	Eiichi Kuboyama	Hiro Masaki	Satoshi Kimura	June 29, 2003 (2003-06-29)	November 29, 2003
Sonic comes running to help Chris' group from their predicament, but the Chaos Emerald ends up being robbed by Eggman. When Sonic and the others follow him to his base, a battle between Eggman and the government's military unfolds before them there. Rouge, Knuckles, and the others who infiltrated the base set up a bomb in the power sector and attempt to escape, but they are locked up by the shutter door. Sonic has to take it upon himself to obtain the (cyan and yellow) Chaos Emeralds and defeat Eggman.
14	"Chase the Hero Sonic!" ("That's What Friends Are For") Transcription: "Eiyū Sonikku o oe!" (Japanese: 英雄ソニックを追え！)	Keiko Oyamada	Yoshio Urasawa	Kenji Yazaki	July 6, 2003 (2003-07-06)	December 6, 2003
Eggman's base is destroyed. However, the press conference's topic is focused on Sonic, who is not present. The presidential aide is upset by this, believing that if this goes on, the President will lose his next election. Wanting to somehow raise the President's popularity, he decides to open up Sonic's victory celebration and have the photo of Sonic shaking hands with the President taken by the media. He immediately sends Sonic a written invitation. Chuck prepares brand new tuxedos for Sonic and the others. However, Sonic says he has something else to do. It turns out he promised to meet with Helen, a girl who is Chris' classmate and wheelchair bound. Wanting to have Sonic present at any cost, the aide uses special forces to chase after him. This is the second episode that Eggman does not appear in.
15	"Mobile Fortress Egg Fort Attacks!" ("Skirmish in the Sky") Transcription: "Idōyōsai Eggu Fōto shūrai!" (Japanese: 移動要塞エッグフォート襲来！)	Toshikiyo Ishikawa	Kiyoko Yoshimura	Toshihiko Masuda	July 13, 2003 (2003-07-13)	December 13, 2003
After his base got destroyed, Dr. Eggman spreads terror through the city with the mobile fortress Egg Fort that was hidden underground. Sonic rushes in to help, but he can't reach the high-flying Egg Fort. Chris and the others, exasperated at the fact that they could have reached it with the X-Tornado, are met with the plane arriving to where they are, brought by Tanaka in a trailer. Sonic boards the X-Tornado and assaults the Egg Fort. The great battle with the Egg Fort starts to unfold.
16	"Aim for It! The Sunken Ship in the Southern Sea" ("Depths of Danger") Transcription: "Mezase! Nankai no chinbotsusen" (Japanese: 目指せ！南海の沈没船)	Masafumi Satō	Chinatsu Hōjō	Masafumi Satō	July 20, 2003 (2003-07-20)	January 17, 2004
While above the overseas resort spot, the (green) Chaos Emerald starts reacting, with the fourth (blue) Chaos Emerald appearing to be under the sea. However, Sonic can't swim. That's when the group goes to the diving shop, wears the necessary equipment, and dives into the ocean. The group goes on a search while relying on the Chaos Emerald's signal, and discovers a sunken ship from the age of exploration. When they find the Chaos Emerald there, they are suddenly attacked by Eggman's robot and get in a dire situation.
17	"Knuckles! Fist of Fury" ("The Adventures of Knuckles and Hawk") Transcription: "Nakkuruzu! Ikari no tekken" (Japanese: ナックルズ！怒りの鉄拳)	Hiroshi Kimura	Masahiko Shiraishi	Toshihiko Masuda	July 27, 2003 (2003-07-27)	January 24, 2004
In Oriental City, Knuckles searches for and reunites with a treasure hunter known as Hawk. The two get out of the dungeon, ride the pedicab, and go to the (red) Chaos Emerald's hiding place. That is where they're met with the pedicab driver from earlier, who turns out to be a female ninja robot (kunoichi) Eggman sent in. Knuckles begins his heroic battle revolving around the Chaos Emerald against the female ninja robot. This episode's Japanese title is a reference to the 1972 Hong Kong martial arts film of the same name.
18	"Huge Shoot-out on the Savanna!" ("The Dam Scam") Transcription: "Sabanna no dai kettō!" (Japanese: サバンナの大決闘！)	Makoto Moriwaki	Hiro Masaki	Naoyuki Kuzuya	August 3, 2003 (2003-08-03)	January 31, 2004
Tails and Chris meet the two men who are building a dam right in the middle of the savanna, and question the pointlessness of its construction. They ask for the construction to be stopped, but the men ignore them. After that, Tails and Chris start a protest march in the city while accompanied by the animals. The men oppose them in order to carry out the construction by all possible means. Then, Eggman's robot arrives, finds Sonic and a fight ensues, with the men getting caught up in the mayhem as well.
19	"Ghost of the Old Castle King Boom Boo" ("Sonic's Scream Test") Transcription: "Kojō no bōrei Kingu Būbu" (Japanese: 古城の亡霊キングブーブ)	Keiko Oyamada Sim Sang-il	Hiro Masaki	Toshihiko Masuda	August 10, 2003 (2003-08-10)	February 7, 2004
Chris and the others arrive at the old castle by the lake shore to watch the making of Chris' mother Lindsay's movie. However, the filming is temporarily stopped due to strange noises that occur during the shooting. It turns out that someone ended up moving the hourglass that sealed the ghosts living in the old castle. Because of that, various mysterious phenomena start happening there. King Boom Boo is based on the same boss that Knuckles fought in Sonic Adventure 2.
20	"Departure! Egg Fort II" ("Cruise Blues") Transcription: "Shutsugeki! Eggu Fōto II" (Japanese: 出撃！エッグフォートII)	Nana Harada	Hiro Masaki	Hajime Kamegaki	August 17, 2003 (2003-08-17)	February 14, 2004
Chris and friends are enjoying a trip on the luxurious passenger boat to the fullest, but Sonic, who runs at supersonic speeds, gets exasperated and anxious at the ship's sluggish pace. When his stress reaches its peak, he resorts to unthinkable actions in an attempt to get home.
21	"Speed Match! Sonic vs. Sam" ("Fast Friends") Transcription: "Supīdo shōbu! Sonikku vs Samu" (Japanese: スピード勝負！ソニックｖｓサム)	Yukio Okazaki	Yoshio Urasawa	Toshihiko Masuda	August 24, 2003 (2003-08-24)	February 21, 2004
The leader of S-Team (Sam) suddenly arrives at Chris' house and challenges Sonic to a race showdown. It appears to be a race carried out at the presidential aide's suggestion in order to elevate the President's popularity. Sonic reluctantly participates and the race showdown begins.
22	"Summer Vacation, a Chao Observation Diary" ("Little Chao Lost") Transcription: "Natsuyasumi Chao~ na kansatsu nikki" (Japanese: 夏休み・チャオ〜な観察日記)	Masafumi Satō	Kiyoko Yoshimura	Kōichi Sasaki	August 31, 2003 (2003-08-31)	February 28, 2004
On a summer vacation, Chris takes Tails' group and his school friends along to enjoy summer camp in a certain island country. Then suddenly, a giant Eggman mech that's trying to capture Chris' group descends and crumbles a mountain which floods a river, leading to quite a dire situation.
23	"Mayhem! 6 Chaos Emeralds" ("Emerald Anniversary") Transcription: "Daikonran! 6 Kaosu Emerarudo" (Japanese: 大混乱！６カオスエメラルド)	Keiko Oyamada Sim Sang-il	Chinatsu Hōjō	Toshihiko Masuda	September 7, 2003 (2003-09-07)	March 6, 2004
Chris' dad purchases a ring (actually a Chaos Emerald) in a jewelry store intending for it to be a gift to Chris' mom for their wedding anniversary. On that day, while she is filming in the studio, dad calls Chris, Chuck, the leader of S-Team etc. there and secretly plans a flashy surprise party, but having noticed the (purple) Chaos Emerald, Eggman, as well as Rouge and Topaz, surge in as well and cause mayhem.
24	"Sonic Goes Wild! Strategic Capture Operation" ("How to Catch a Hedgehog") Transcription: "Bōsō Sonikku! Hokaku daisakusen" (Japanese: 暴走ソニック！捕獲大作戦)	Makoto Moriwaki	Masahiko Shiraishi	Kōji Hōri	September 14, 2003 (2003-09-14)	March 13, 2004
While fighting Eggman, Sonic suddenly starts going wild. Chuck and Tails' group commence a Sonic capture operation in order to stop him as he's running all around. Knuckles, Amy, and Sam Speed join in as well and their plans get increasingly more complicated.
25	"The Last Chaos Emerald" ("A Dastardly Deed") Transcription: "Saigo no Kaosu Emerarudo" (Japanese: 最後のカオスエメラルド)	Yukio Okazaki	Hiro Masaki	Toshihiko Masuda	September 21, 2003 (2003-09-21)	March 20, 2004
Knuckles arrives at Chris' house, intending to persuade Sonic into working with Eggman in order to obtain the seventh Chaos Emerald as soon as possible. However, instead of meeting Sonic, Chris ends up listening to what Knuckles has to say, and the two head into the forest where Eggman is.
26	"Birth! Super Sonic" ("Countdown to Chaos") Transcription: "Tanjō! Sūpā Sonikku" (Japanese: 誕生！スーパーソニック)	Hajime Kamegaki	Hiro Masaki	Hajime Kamegaki	September 28, 2003 (2003-09-28)	March 27, 2004
Chris, wanting to get Sonic and his friends back to their own world as soon as possible, ends up handing the Chaos Emeralds stored by Chuck over to Eggman. Having noticed that, Sonic and the others run after him in a hurry. However, Eggman ends up finding the last (white) Chaos Emerald. A tense battle ensues. The original Japanese TV broadcast uses an insert song "Kotoba ni Dekinai" by OFF COURSE, while the home video release uses an instrumental of "The Shining Road."

Season 2: The Chaos, Shadow, Egg Moon, Emerl, and Homebound Sagas (2004–05)

No. in series	No. in season	Title (English dub title)	Directed by	Written by	Storyboarded by	Original air date	American air date
27	1	"The Beginning of Disaster" ("Pure Chaos") Transcription: "Wazawai no hajimari" (Japanese: 災いのはじまり)	Kazuyoshi Yokota	Kiyoko Yoshimura	Kazuyoshi Yokota	October 5, 2003 (2003-10-05)	September 18, 2004
With Eggman defeated, it appears that the world has become peaceful again, but not too long after, Eggman resumes activity. He develops the new E-100 series of Eggman robots that have small animals inserted in them as pilot parts, takes along a monster known as Chaos, and is about to start wreaking havoc once again. This episode is a prequel to Sonic Adventure.
28	2	"The Mysterious Life Form Chaos" ("A Chaotic Day") Transcription: "Nazo no seimeitai Kaosu" (Japanese: 謎の生命体カオス)	Masafumi Satō	Kiyoko Yoshimura	Kazuhito Kikuchi	October 12, 2003 (2003-10-12)	September 25, 2004
After fighting an evolved Chaos, Sonic chases after Eggman and is locked in an air battle with the Egg Carrier, but the X-Tornado ends up crashing. Meanwhile Amy, who finds a small bird that fell from the Egg Carrier, gets captured by Eggman's robot E-100.
29	3	"Amy the Captive" ("A Robot Rebels") Transcription: "Toraware no Emī" (Japanese: 囚われのエミー)	Keiko Oyamada Sim Sang-il	Chinatsu Hōjō	Toshihiko Masuda	October 19, 2003 (2003-10-19)	October 2, 2004
Chris and Big find Big's lost friend Froggy, but E-102 (Gamma) ends up capturing him. Chris and Big follow it and infiltrate the Egg Carrier. Eggman orders E-102 to bring the small bird from the prison Amy is in, but E-102 ends up being afflicted in front of her prison and releases both her and the small bird from there. Meanwhile, Sonic and Tails once again chase the Egg Carrier, with Knuckles coming along to find the broken pieces of the Master Emerald.
30	4	"Battle on the Egg Carrier" ("Heads Up, Tails!") Transcription: "Eggu Kyaria no tatakai" (Japanese: エッグキャリアの戦い)	Shigeru Yazaki	Yoshio Urasawa	Hiro Masaki	October 26, 2003 (2003-10-26)	October 9, 2004
After landing on the Egg Carrier on the X-Tornado, Sonic and Tails attempt to defeat E-102, but are stopped by Amy. Meanwhile, Big and Chris find Froggy, but end up being met with Eggman. Sonic arrives at just the right moment to defeat Chaos.
31	5	"Gamma the Wanderer" ("Revenge of the Robot") Transcription: "Sasurai no Ganma" (Japanese: さすらいのガンマ)	Makoto Moriwaki	Masahiko Shiraishi	Makoto Moriwaki	November 2, 2003 (2003-11-02)	October 16, 2004
Sonic finds and breaks into Eggman's underground base Final Egg. At the same time, Gamma starts going around various places to free the animals from his fellow robots but is soon met with E-101 (Beta), leading to a tense battle between the two.
32	6	"The Scream of Perfect Chaos" ("Flood Fight") Transcription: "Pāfekuto Kaosu no sakebi" (Japanese: パーフェクトカオスの叫び)	Nana Harada	Masahiko Shiraishi	Toshiki Hirano	November 9, 2003 (2003-11-09)	October 23, 2004
It turns out that Chaos survived the previous battle and stops listening to Eggman. After obtaining all seven Chaos Emeralds, he evolves into a ferocious Perfect Chaos and starts rampaging through the city. Then, Sonic's body suddenly shines in a bright light, and the mystery and truth of Chaos is revealed. This is the last episode to use the plot of Sonic Adventure.
33	7	"The Mystery of Project Shadow" ("Project: Shadow") Transcription: "Purojekuto Shadō no nazo" (Japanese: プロジェクトシャドウの謎)	Keiko Oyamada Eom Sang-yong	Hiro Masaki	Toshihiko Masuda	November 16, 2003 (2003-11-16)	October 30, 2004
While hacking into GUN's computers, Eggman learns that his grandfather (Gerald Robotnik) has connections to GUN's top secret weapon Project Shadow. Then, in order to obtain it, he infiltrates Prison Island, taking Decoe and Bocoe along. This episode is a prequel to Sonic Adventure 2.
34	8	"Sonic the Fugitive" ("Shadow Knows") Transcription: "Tōbōsha Sonikku" (Japanese: 逃亡者ソニック)	Masafumi Satō	Masahiko Shiraishi	Kazuhito Kikuchi	November 23, 2003 (2003-11-23)	November 6, 2004
Sonic is arrested by GUN, who believe he was the one who stole the secret of Project Shadow and infiltrated Prison Island. Completely clueless, Sonic escapes from GUN's helicopter and starts being chased. Sonic is determined to find out what exactly is going on.
35	9	"Escape from Prison Island" ("Sonic's Big Break") Transcription: "Purizun Airando kara no dasshutsu" (Japanese: プリズンアイランドからの脱出)	Ichizō Fukushima	Chinatsu Hōjō	Jōhei Matsuura	November 30, 2003 (2003-11-30)	November 13, 2004
Sonic is taken to Prison Island's isolation cell. Chris and Tanaka get on board the swan boat and head to rescue Sonic, while Amy and Tails head there via the X-Tornado. Eggman once again attempts to infiltrate Prison Island along with Shadow and Rouge in order to obtain the Chaos Emeralds.
36	10	"Threat from Outer Space" ("Shadow World") Transcription: "Uchū kara no kyōhaku" (Japanese: 宇宙からの脅迫)	Shigeru Yazaki	Hiro Masaki	Seiji Okuda	December 7, 2003 (2003-12-07)	November 20, 2004
Prison Island blows up, and Chris gets caught up in Shadow's Chaos Control, escaping death. When he comes to, he realizes that he's on the Space Colony ARK. Meanwhile, Eggman shows the world the destructive power of the colony's cannon and gives an ultimatum.
37	11	"Battle on the Space Colony: ARK" ("Robotnik's Revenge") Transcription: "Supēsu koronī Āku no tatakai" (Japanese: スペースコロニー・アークの戦い)	Mamoru Enomoto	Kiyoko Yoshimura	Toshihiko Masuda	December 14, 2003 (2003-12-14)	November 27, 2004
In order to stop Eggman from destroying the Earth, Sonic and the others head to the Space Colony ARK in a rocket. Then, Sonic breaks in, but is captured and thrown out into the void of space, but not before being given a fake Chaos Emerald by Tails that he and Chuck developed.
38	12	"Maria's Wish, Everyone's Wish" ("Showdown In Space") Transcription: "Maria no negai, minna no negai" (Japanese: マリアの願い、みんなの願い)	Nana Harada	Kiyoko Yoshimura	Toshiki Hirano	December 21, 2003 (2003-12-21)	December 4, 2004
The fight between Sonic and Shadow ensues. However, the Space Colony ARK's computers start going out of control, and trigger an irreversible program that effectively turns the whole colony into a giant bomb. If nothing is done, ARK will collide with the Earth. The group decides to set aside their differences and work together to prevent the disaster, but Shadow is not letting his plan be spoiled that easily. This is the last episode to use the plot of Sonic Adventure 2.
39	13	"Chaotix Detective Agency" ("Defective Detectives") Transcription: "Kaotikusu tantei jimusho" (Japanese: カオティクス探偵事務所)	Makoto Moriwaki	Yoshio Urasawa	Hajime Kamegaki	December 28, 2003 (2003-12-28)	December 11, 2004
A detective team consisting of Vector, Espio and Charmy is introduced, who appear to be looking for Cream and start loitering around her location. Meanwhile, Eggman claims to have a change of heart and goes out of his way to repair the moon he previously destroyed with the colony's cannon, but his true motives are unclear. This episode aired 2 days before the release of Sonic Heroes in Japan.
40	14	"Eggman Corporation" ("Sunblock Solution") Transcription: "Egguman kabushikigaisha" (Japanese: エッグマン株式会社)	Masafumi Satō	Hiro Masaki	Matsuo Asami	January 4, 2004 (2004-01-04)	December 18, 2004
All of a sudden, Eggman's artificial moon covers the sun, and the world is covered in darkness. The reformed Eggman proposes a sunlight supply service to the President and earns positive feedback from the citizens, but this appears to be what Eggman planned all along.
41	15	"Give Us the Light!" ("Eggman for President") Transcription: "Hikari o warera ni!!" (Japanese: 光をわれらに！！)	Mamoru Enomoto	Hiro Masaki	Kiyoshi Egami	January 11, 2004 (2004-01-11)	January 22, 2005
The citizens get progressively furious at Sonic's attempts to hinder Eggman's sunlight supply service. Chris cannot confidently defend Sonic and goes to stop him, but deep down he knows that the sunlight's blockade was in fact part of Eggman's evil plan.
42	16	"Amy, Love's Escape?!" ("A Date to Forget") Transcription: "Emī ai no tōhikō!?" (Japanese: エミー愛の逃避行！？)	Shigeru Yazaki	Kiyoko Yoshimura	Seiji Okuda	January 18, 2004 (2004-01-18)	January 29, 2005
Sonic promises a date with Amy, but does not show up no matter how much time passes. Amy is furious and ends up going on a car trip with Sam Speed, who just happened to visit. However, this is where they encounter an Eggman mech that intends to free Eggman, who was imprisoned for his previous actions. Meanwhile, Cream and Cheese discover an unfamiliar face in the garden of Chris' house. This episode is a prequel to Sonic Battle.
43	17	"Huge Home Electronics Panic!" ("Mean Machines") Transcription: "Kaden daipanikku!!" (Japanese: 家電大パニック！！)	Jōhei Matsuura	Hiro Masaki	Jōhei Matsuura	January 25, 2004 (2004-01-25)	February 5, 2005
Along with the imprisoned Eggman, Decoe and Bocoe are put to work in a home electronics factory, they insert a mysterious chip in many of the products. Due to that, the whole city's home appliances start moving on their own and attacking humans. Sonic and the others have to find a solution to this problematic situation.
44	18	"The Ridiculous Epic Spy Battle" ("Sewer Search") Transcription: "Okashi na okashi na supai daisakusen" (Japanese: おかしなおかしなスパイ大作戦)	Nana Harada	Yoshio Urasawa	Toshiki Hirano	February 1, 2004 (2004-02-01)	February 12, 2005
Stewart commences a search for Eggman, who escaped from jail, in order to catch him. However, he ends up being found by Chris and his friends, and all of them decide to go on a search together.
45	19	"Sonic Battle: Face Off!" ("Prize Fights") Transcription: "Sonikku Batoru kaisai!!" (Japanese: ソニックバトル開催！！)	Kenichi Maejima	Hiro Masaki Chinatsu Hōjō	Masanori Mizuhara	February 8, 2004 (2004-02-08)	February 19, 2005
The President proposes a martial arts tournament with the Chaos Emerald as the prize as part of a larger plan to capture Eggman. Sonic, as well as Knuckles and Chris, and even Emerl all end up participating.
46	20	"Sonic Battle: Finale!" ("A Wild Win") Transcription: "Sonikku Batoru kesshō!!" (Japanese: ソニックバトル決勝！！)	Kazuyoshi Yokota	Hiro Masaki Chinatsu Hōjō	Kazuhito Kikuchi	February 15, 2004 (2004-02-15)	February 26, 2005
It is time for the finals, however Emerl reacts to the Chaos Emerald and starts going berserk, with everyone joining in the fight to stop him. With his Skill Get ability that makes him able to copy the moves of others, he is quite a formidable threat. This is the last episode to use the plot of Sonic Battle.
47	21	"Big Decisive Battle on Latitude 0!" ("Map Of Mayhem") Transcription: "Ido 0 daikessen!!" (Japanese: 緯度０大決戦！！)	Makoto Moriwaki	Masahiko Shiraishi	Makoto Moriwaki	February 22, 2004 (2004-02-22)	March 5, 2005
Eggman declares that he will destroy the planet by using a giant battleship and triggering the "navel of the world" that runs through the submarine volcanic range. Sonic and the others try to stop him, but they are met with a lot more hardships and shocking discoveries than they anticipated. This episode's Japanese title is very similar to the Japanese title of the 1969 sci-fi film Latitude Zero and there are several homages to the movie throughout the episode itself.
48	22	"Sonic Vs. the Underground Monsters" ("The Volcanic Venture") Transcription: "Sonikku tai chitei kaijū" (Japanese: ソニック対地底怪獣)	Mihiro Yamaguchi	Masahiko Shiraishi	Seiji Okuda	February 29, 2004 (2004-02-29)	March 12, 2005
Eggman escapes to the volcanic island's crater via the Egg Giant-Makan. When Sonic and the others follow him and go from the crater to the underground world, they end up meeting giant ferocious beasts. This episode's Japanese title is very similar to the Japanese title of the 1965 sci-fi kaiju film Frankenstein Conquers the World and there are several homages to the movie throughout the episode itself.
49	23	"The Day the World Stood Still" ("The Beginning of the End") Transcription: "Sekai ga seishi suru hi" (Japanese: 世界が静止する日)	Mamoru Enomoto	Masahiko Shiraishi	Kiyoshi Egami	March 7, 2004 (2004-03-07)	March 12, 2005
According to the government, if Sonic and friends continue to stay in their world, it will trigger a time stagnation phenomenon, causing abnormalities in the world. It is then suggested that Sonic and the others should be returned into their own world, but Chris does not appear willing to let Sonic go. This episode's Japanese title is similar to the title of the 1951 sci-fi film The Day the Earth Stood Still.
50	24	"Morning of Farewells" ("Running out of Time") Transcription: "Wakare no asa" (Japanese: 別れの朝)	Masami Furukawa	Chinatsu Hōjō	Toshiki Hirano	March 14, 2004 (2004-03-14)	March 19, 2005
In order to return Sonic and the others back into their own world, Tails and Chuck rush to develop the device necessary to make it happen. Then, Eggman's base is suddenly attacked by GUN's forces, which was not the President's intent.
51	25	"Chris' Long Journey" ("Friends 'till the End") Transcription: "Kurisu no nagai tabi" (Japanese: クリスの長い旅)	Shigeharu Takahashi	Kiyoko Yoshimura	Masanori Mizuhara	March 21, 2004 (2004-03-21)	March 19, 2005
As soon as Sonic is about to return to his own world, Chris takes his hand and runs off with him. The duo then goes out on a journey, with Chris eventually coming to accept the truth.
52	26	"Memories of the Wind" ("A New Start") Transcription: "Kaze no omoide" (Japanese: 風の思い出)	Hajime Kamegaki	Yoshio Urasawa	Hajime Kamegaki	March 28, 2004 (2004-03-28)	March 26, 2005
Sonic returns to his own world. Meanwhile Chris, who is now 18 years old, looks back on all the memories he had with him. The original TV broadcast uses insert songs "Natsu no Hi" and "Midori no Hibi" by OFF COURSE, while home video releases use "The Shining Road" and "Event: The Last Scene" from Sonic Adventure 2.

Season 3: The Metarex Saga (2005-06)

No. in series	No. in season	Title (English dub title)	Directed by	Written by	Storyboarded by	Japanese air date	International air date(s)
53	1	"The Messenger from a Meteor Shower" ("A Cosmic Call") Transcription: "Ryūseiu no shisha" (Japanese: £¢€¥€¥)	Mitsutaka Noshitani	Kiyoko Yoshimura	Toshiki Hirano	April 4, 2020 (April 4, 2020)	March 12, 2005 (France) September 10, 2005 (US)
Sonic and his friends' planet is attacked by a new formidable enemy called the Metarex. Sonic struggles in the fight and scatters the seven Chaos Emeralds across the galaxy, and a lone Metarex ends up robbing the planet of its life source, the Planet Egg. Then, an 18 year old Chris warps to Sonic's planet using a machine he created, but ends up reverting to the body of a 12 year old due to a time dilation between the worlds.
54	2	"The Spaceship Blue Typhoon" ("Cosmic Crisis") Transcription: "Uchūsen Burū Taifūn-gō" (Japanese: £¢€¥¥¥£¢€¥€¥¥¥¥¥€¥¥¥)	Hideki Hiroshima	Kiyoko Yoshimura	Masanori Mizuhara	April 11, 2020 (April 11, 2020)	March 12, 2005 (France) September 17, 2005 (US)
The group meets Cosmo, who claims to have come to their planet to find Sonic in order to reclaim the Planet Eggs of various planets from the Metarex. Hearing that, Sonic and his friends decide to depart into space. However, they are once again attacked by Metarex Spike while building the space ship. Sonic is then used as a bullet for the space ship's primary weapon, the Sonic Driver, to defeat Metarex Spike.
55	3	"The Water Planet Hydo" ("H2 Whoa") Transcription: "Mizu no wakusei Haidō" (Japanese: £¢€¥¥£¥£¢)	Hideki Hiroshima	Kiyoko Yoshimura	Masanori Mizuhara	April 18, 2020 (April 18, 2020)	March 13, 2005 (France) September 24, 2005 (US)
The space ship boarded by Sonic and his friends, the Blue Typhoon, arrives on the planet Hydo, which was robbed of its Planet Egg and became flooded as a result. Sonic and Chris board a landing vessel to find the Planet Egg, but Sonic gets captured by the Metarex. As Amy takes care of Sonic's rescue and Tails provides the X-Tornado to pick them up, Chris ends up having to assist on this mission using the skills he had acquired over the past six years in his own world.
56	4	"Dr. Eggman Joins the War!" ("An Enemy In Need") Transcription: "Dokutā Egguman sansen!" (Japanese: Dr.¢£¢€€¥¥€¥¥!)	Takuo Suzuki	Hiro Masaki	Masanori Mizuhara	April 25, 2020 (April 25, 2020)	March 14, 2005 (France) October 1, 2005 (US)
During the brief period of planet Hydo's people thanking Sonic and his friends for defeating the Metarex, Eggman tricks Knuckles and tries to obtain the Chaos Emerald. However, a frog-shaped Metarex appears and swallows it. The group must prevent the Metarex from stealing the Planet Egg again.
57	5	"The Battle on the Ice Palace" ("A Chilling Discovery") Transcription: "Aisu paresu no tatakai" (Japanese: £¢€¥€¥£€¥€¥¢€¥)	Kazunori Tanahashi	Masahiko Shiraishi	Seiji Okuda	May 2, 2020 (May 2, 2020)	March 15, 2005 (France) October 8, 2005 (US)
Sonic and his friends arrive on a snowy planet to look for the Chaos Emerald and reach an ice palace where the Metarex are. There, they find what appears to be a research procedure of some sort as well as a Chaos Emerald, or at least, what looks like it.
58	6	"The Maidens' Jungle Trap" ("Desperately Seeking Sonic") Transcription: "Otome no janguru torappu" (Japanese: £¢€¥€¥€¥€¥£¢€¥€¥)	Nana Harada	Kiyoko Yoshimura	Seiji Okuda	May 9, 2020 (May 9, 2020)	March 16, 2005 (France) October 15, 2005 (US)
Sonic and his friends arrive at a jungle planet and encounter a pair of Metarex who have just stolen its Planet Egg. One of them ends up being repelled by the Sonic Driver, but Sonic is hurled towards the planet from the weapon's sheer force. Amy, aided by Cream and Cosmo, decides to look for him and get the Planet Egg back from the surviving Metarex.