Table of Contents
2003 Colour Series
In 2003, in celebration of Astro Boy's 40th anniversary, Tezuka Productions and Sony Pictures released a brand new Astro Boy cartoon. The series consisted of 50 episodes.
The American episode order differed from the Japanese episode order. On the American episode list below, the corresponding Japanese episode number is listed in parentheses.
In the English dub, Eternal Boy was replaced by Dawn of the Techno Revolution due to its similarities with the story of Peter Pan.
Japanese Episode Order
| Translated Episode Name | Japanese Episode Name | Original Air Date |
| 1. Power Up! | パワーアップ！ | April 6, 2003 |
| 2. Robot Ball | ロボットボール | April 13, 2003 |
| 3. Atom In Space | アトム宇宙へ行く | April 20, 2003 |
| 4. Thunderbolt | 電光 | April 27, 2003 |
| 5. Save the Roboter Farm! | ロボット農場を救え！ | May 4, 2003 |
| 6. Atlas Birth | アトラル誕生 | May 11, 2003 |
| 7. Atom vs. Atlas | アトムＶＳアトラス | May 18, 2003 |
| 8. Neon Express | ロボット超特急 | May 25, 2003 |
| 9. Franken | フランケン | June 1, 2003 |
| 10. Venus Robot Invasion! | 金星ロボット襲来！ | June 8, 2003 |
| 11. The Robot Circus Arrives! | ロボットサーカスがやって来た！ | June 15, 2003 |
| 12. Jumbo Revived! | 蘇ったジャンボ！ | June 22, 2003 |
| 13. The Birth of Uran | ウラン誕生 | July 6, 2003 |
| 14. Adventures of Micro | ミクロの大冒険 | July 13, 2003 |
| 15. Population's Intelligence Protection! | 人工知能を守れ！ | July 20, 2003 |
| 16. Dark Robot Hunter | 闇のロボットハンター | July 27, 2003 |
| 17. The Strongest Ground Robot | 地上最強のロボット | August 3, 2003 |
| 18. The Dead Brute | ブルートウは死なず | August 10, 2003 |
| 19. Robot Boy | ロボットボーイ | August 17, 2003 |
| 20. Eternal Boy | 永遠の少年 | August 24, 2003 |
| 21. Monster Lake | 湖の怪物 | August 31, 2003 |
| 22. Goodbye Princess | さよならプリンセス | September 7, 2003 |
| 23. Lost Memory | 失われた記憶 | September 14, 2003 |
| 24. Bear-chan | ベアちゃん | September 21, 2003 |
| 25. Dr. Moshimo's Tears | もしも涙を流せたら | September 28, 2003 |
| 26. The Blue Knight Appears | 青騎士登場 | October 5, 2003 |
| 27. Detective Higeoyaji | 名探偵ヒゲオヤジ | October 12, 2003 |
| 28. Crisis of the Universe's Plant | 宇宙プラントの危機 | October 19, 2003 |
| 29. The Detective and Uran | ウランと名探偵 | October 26, 2003 |
| 30. Exploring the Underground | 地底探検 | November 2, 2003 |
| 31. Gunon's Adventure | グーノンの大冒険 | November 9, 2003 |
| 32. Secret of the Blue Knight | 青騎士の秘密 | November 16, 2003 |
| 33. Fairy Tale | 妖精物語 | November 23, 2003 |
| 34. Deformation of Mupi | 変形生命ムーピー | November 30, 2003 |
| 35. Atom vs. Rock | アトムＶＳロック | December 7, 2003 |
| 36. Robots in Love | 恋するロボット | December 14, 2003 |
| 37. Atlas Strikes Back | アトラス逆襲 | December 21, 2003 |
| 38. Emily's Wish | エイミーの願い | December 28, 2003 |
| 39. Time Hunters | タイムハンター | January 11, 2004 |
| 40. Robot Hatred | ロボット嫌い | January 18, 2004 |
| 41. Giant's Record | 巨人の記録 | January 25, 2004 |
| 42. Battle of Steel Island | 鉄鋼島の戦い | February 1, 2004 |
| 43. Robot Longing for a Human | 人間に憧れたロボット | February 8, 2004 |
| 44. To the Dragon's Forest | 龍の森へ | February 15, 2004 |
| 45. The Eve of the Revolution | 革命前夜 | February 22, 2004 |
| 46. Founding Robotonia | ロボタニア建国 | February 29, 2004 |
| 47. Decisive Battle! Robotonia | 決戦！南極大陸 | March 7, 2004 |
| 48. Journey to Tomorrow | 明日への旅立ち | March 14, 2004 |
| 49. Atom's Revival | アトム復活 | March 21, 2004 |
| 50. Final Showdown | 最後の対決 | March 28, 2004 |
American Episode Order
| Episode Name | Original Air Date |
| 1. (1) Power Up! | January 17, 2004 |
| 2. (2) Rocket Ball | January 24, 2004 |
| 3. (5) Atlas | January 31, 2004 |
| 4. (7) Astro vs Atlas | February 7, 2004 |
| 5. (3) Destination Deimos | March 10, 2004 |
| 6. (4) Into Thin Air | March 11, 2004 |
| 7. (5) Rainbow Canyon | March 15, 2004 |
| 8. (8) Neon Express | March 18, 2004 |
| 9. (9) Franken | March 22, 2004 |
| 10. (10) Venus Robots | March 23, 2004 |
| 11. (11) Reviving Jumbo | March 23, 2004 |
| 12. (16) Robot Hunters | March 25, 2004 |
| 13. (17) The Rise of Pluto | March 29, 2004 |
| 14. (18) The Fall of Acheron | March 30, 2004 |
| 15. (21) Dragon Lake | March 24, 2004 |
| 16. (23) Lost in Outland | March 25, 2004 |
| 17. (25) Deep City | March 29, 2004 |
| 18. (26) The Blue Knight | April 6, 2004 |
| 19. (28) Hydra-Jacked | March 30, 2004 |
| 20. (30) Geo Raider | March 30, 2004 |
| 21. (32) Secret of the Blue Knight | April 30, 2004 |
| 22. (11) Robot Circus | March 31, 2004 |
| 23. (13) Little Sister, Big Trouble | April 1, 2004 |
| 24. (14) Micro Adventure | April 1, 2004 |
| 25. (15) Only a Machine | April 5, 2004 |
| 26. (19) Robot Boy | April 6, 2004 |
| 27. (N/A) Dawn of the Techno Revolution | April 6, 2004 |
| 28. (22) The Legend of Tohron | April 26, 2004 |
| 29. (24) March of the Micro Bears | April 26, 2004 |
| 30. (27) Old Dog, New Tricks | May 26, 2007 |
| 31. (29) The Case of the Phantom Fowl | June 2, 2007 |
| 32. (31) Gideon | June 9, 2007 |
| 33. (33) Fairy Tale | June 16, 2007 |
| 34. (34) Shape Shifter | June 23, 2007 |
| 35. (35) Phoenix | June 30, 2007 |
| 36. (36) Space Academy | July 7, 2007 |
| 37. (37) Atlas Strikes Back | July 14, 2007 |
| 38. (38) Battle-Bot | July 21, 2007 |
| 39. (39) Time Hunters | July 28, 2007 |
| 40. (40) Escape from Volcano Island | August 4, 2007 |
| 41. (41) Avalanche | August 11, 2007 |
| 42. (42) Battle of Steel Island | August 18, 2007 |
| 43. (43) Undercover | August 25, 2007 |
| 44. (44) Into the Dragon's Lair | September 1, 2007 |
| 45. (45) Night Before the Revolution | September 8, 2007 |
| 46. (46) Robotonia | September 15, 2007 |
| 47. (47) Showdown in Robotonia | September 22, 2007 |
| 48. (48) Journey to Tomorrow | September 29, 2007 |
| 49. (49) Astro Reborn | October 6, 2007 |
| 50. (50) The Final Battle | October 13, 2007 |