It has been thirty two years since the Invaders have been defeated, and A.E.G.I.S is dismantled, with only a few Gate Keepers left. One of them, Ayane Isuzu learns that Machine General and Devil Count are back and they must save the Earth once more.
Is Gate Keepers 21 on Netflix? Unfortunately this serie is not yet available on Netflix.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Begin the Defense of the Earth | 2000-04-03 | 25 min |
| Season 1 | Episode 2 | Stand Up For Peace | 2000-04-10 | 25 min |
| Season 1 | Episode 3 | Play the Dazzling Music | 2000-04-17 | 25 min |
| Season 1 | Episode 4 | Finding a New Warrior | 2000-04-24 | 25 min |
| Season 1 | Episode 5 | Run Towards Your Dream! | 2000-05-01 | 25 min |
| Season 1 | Episode 6 | Infiltrate the Girl's Dormitory of Terror! | 2000-05-08 | 25 min |
| Season 1 | Episode 7 | Shoot Down the Enemy Out of the Sky | 2000-05-15 | 25 min |
| Season 1 | Episode 8 | Find the Invader! | 2000-05-22 | 25 min |
| Season 1 | Episode 9 | Break the Pitch Dark Gate | 2000-05-29 | 25 min |
| Season 1 | Episode 10 | Get Over the Devil's Dream | 2000-06-05 | 25 min |
| Season 1 | Episode 11 | Stop That Bullet Train! | 2000-06-12 | 25 min |
| Season 1 | Episode 12 | Fly to the Northern Land | 2000-06-19 | 25 min |
| Season 1 | Episode 13 | Bring Down, Two of the Powerful Brass Part 1 | 2000-06-26 | 25 min |
| Season 1 | Episode 14 | Bring Down, Two of the Powerful Brass Part 2 | 2000-07-03 | 25 min |
| Season 1 | Episode 15 | Ruin the Arranged Marriage | 2000-07-10 | 25 min |
| Season 1 | Episode 16 | Sally Fourth, Gate Robot! | 2000-07-17 | 25 min |
| Season 1 | Episode 17 | Flying Down Your Own Road | 2000-07-24 | 25 min |
| Season 1 | Episode 18 | Protect the Invader!? | 2000-07-31 | 25 min |
| Season 1 | Episode 19 | Listen to the Opinion of the Youth | 2000-08-07 | 25 min |
| Season 1 | Episode 20 | Leap into the New Year! | 2000-08-21 | 25 min |
| Season 1 | Episode 21 | Protect the Festival of Progress and Harmony! | 2000-08-28 | 25 min |
| Season 1 | Episode 22 | Beat the Jet Black Robot! | 2000-09-04 | 25 min |
| Season 1 | Episode 23 | Exert All Your Courage to Fight! | 2000-09-11 | 25 min |
| Season 1 | Episode 24 | For Tomorrow Smiles... | 2000-09-18 | 25 min |
| Season 2 | Episode 1 | Encounter | 2002-04-24 | 25 min |
| Season 2 | Episode 2 | Mad Dash | 2002-07-17 | 25 min |
| Season 2 | Episode 3 | Late Summer | 2002-08-21 | 25 min |
| Season 2 | Episode 4 | Ayane | 2002-09-19 | 25 min |
| Season 2 | Episode 5 | Miu | 2002-10-17 | 25 min |
| Season 2 | Episode 6 | The Sound of Wings | 2003-01-08 | 25 min |
| Directing | Hiroshi Yamaguchi | Director |
| Production | Takashi Watanabe | Producer |
| Sound | Kohei Tanaka | Music |
| Visual Effects | Keiji Gotoh | Character Designer |
| Art | Masanori Kikuchi | Art Direction |
| Sound | Yota Tsuruoka | Sound Director |
| Camera | Takashi Horiuchi | Director of Photography |
| Visual Effects | Eriko Murata | Color Designer |
| Sound | Sakura Nogawa | Theme Song Performance |
| Sound | Junko Watanabe | Theme Song Performance |
| Visual Effects | Tomohiro Kawahara | Mechanical Designer |
| Visual Effects | Toshiaki Ihara | Mechanical Designer |
| Production | Futagi Daisuke | Producer |
| Production | Masafumi Fukui | Producer |
| Production | Shouji Murahama | Producer |
| Writing | Hiroshi Yamaguchi | Original Story |
