Astro is a robotic boy created by Dr. Tenma to replace his late son. When Tenma destroys his laboratory and shuts down Astro, the Ministry of Science revives him and tries to give him a normal life as a 6th-grade student who occasionally helps keep renegade robots from causing harm.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Power Up! | 2003-04-06 | 30 min |
| Season 1 | Episode 2 | Rocket Ball | 2003-04-13 | 30 min |
| Season 1 | Episode 3 | Destination Deimos | 2003-04-20 | 30 min |
| Season 1 | Episode 4 | Into Thin Air | 2003-04-27 | 30 min |
| Season 1 | Episode 5 | Rainbow Canyon | 2003-05-04 | 30 min |
| Season 1 | Episode 6 | Atlas (1) | 2003-05-11 | 30 min |
| Season 1 | Episode 7 | Astro vs Atlas (2) | 2003-05-18 | 30 min |
| Season 1 | Episode 8 | Neon Express | 2003-05-25 | 30 min |
| Season 1 | Episode 9 | Franken | 2003-06-01 | 30 min |
| Season 1 | Episode 10 | The Venus Robots | 2003-06-08 | 30 min |
| Season 1 | Episode 11 | Robot Circus | 2003-06-16 | 30 min |
| Season 1 | Episode 12 | Reviving Jumbo | 2003-06-22 | 30 min |
| Season 1 | Episode 13 | Little Sister, Big Trouble | 2003-07-06 | 30 min |
| Season 1 | Episode 14 | Micro Adventure | 2003-07-13 | 30 min |
| Season 1 | Episode 15 | Only a Machine | 2003-07-20 | 30 min |
| Season 1 | Episode 16 | Robot Hunters | 2003-07-27 | 30 min |
| Season 1 | Episode 17 | The Rise of Pluto (1) | 2003-08-03 | 30 min |
| Season 1 | Episode 18 | Fall of Acheron (2) | 2003-08-10 | 30 min |
| Season 1 | Episode 19 | Robot Boy | 2003-08-17 | 30 min |
| Season 1 | Episode 20 | Dawn of the Techno-Revolution | 2003-08-24 | 30 min |
| Season 1 | Episode 21 | Dragon Lake | 2003-08-31 | 30 min |
| Season 1 | Episode 22 | The Legend of Tohron | 2003-09-07 | 30 min |
| Season 1 | Episode 23 | Lost In Outland | 2003-09-14 | 30 min |
| Season 1 | Episode 24 | March of the Micro Bears | 2003-09-21 | 30 min |
| Season 1 | Episode 25 | Deep City | 2003-09-28 | 30 min |
| Season 1 | Episode 26 | The Blue Knight | 2003-10-05 | 30 min |
| Season 1 | Episode 27 | Old Dog, New Tricks | 2003-10-12 | 30 min |
| Season 1 | Episode 28 | Hydra-Jacked | 2003-10-19 | 30 min |
| Season 1 | Episode 29 | The Case of the Phantom Fowl | 2003-10-26 | 30 min |
| Season 1 | Episode 30 | Geo Raider | 2003-11-02 | 30 min |
| Season 1 | Episode 31 | Gideon | 2003-11-09 | 30 min |
| Season 1 | Episode 32 | The Secret of Blue Knight | 2003-11-16 | 30 min |
| Season 1 | Episode 33 | Fairy Tale | 2003-11-23 | 30 min |
| Season 1 | Episode 34 | Shape Shifter | 2003-11-30 | 30 min |
| Season 1 | Episode 35 | Firebird | 2003-12-07 | 30 min |
| Season 1 | Episode 36 | Space Academy | 2003-12-14 | 30 min |
| Season 1 | Episode 37 | Atlas Strikes Back | 2003-12-21 | 30 min |
| Season 1 | Episode 38 | Battle-Bot | 2003-12-28 | 30 min |
| Season 1 | Episode 39 | Time Hunters | 2004-01-11 | 30 min |
| Season 1 | Episode 40 | Escape from Volcano Island | 2004-01-18 | 30 min |
| Season 1 | Episode 41 | Avalanche! | 2004-01-25 | 30 min |
| Season 1 | Episode 42 | Battle of Steel Island | 2004-02-01 | 30 min |
| Season 1 | Episode 43 | Undercover | 2004-02-08 | 30 min |
| Season 1 | Episode 44 | Into the Dragon's Lair | 2004-02-15 | 30 min |
| Season 1 | Episode 45 | Night Before the Revolution | 2004-02-22 | 30 min |
| Season 1 | Episode 46 | Robotonia | 2004-02-29 | 30 min |
| Season 1 | Episode 47 | Showdown in Robotonia | 2004-03-07 | 30 min |
| Season 1 | Episode 48 | Journey to Tomorrow | 2004-03-14 | 30 min |
| Season 1 | Episode 49 | Astro Reborn | 2004-03-21 | 30 min |
| Season 1 | Episode 50 | The Final Battle | 2004-03-28 | 30 min |
| Directing | Kazuya Konaka | Director |
| Art | Hiroshi Kato | Art Direction |
| Production | Tsuneyuki Morishima | Producer |
| Production | Takayuki Matsutani | Executive Producer |
| Visual Effects | Shinji Seya | Animation Director |
| Writing | Osamu Tezuka | Comic Book |
| Visual Effects | Shinji Seya | Character Designer |
| Visual Effects | Xin Kuo | Character Designer |
