Tokyo, 1969. Earth is under attack from the "Invaders." The public is unaware of this but to the secret organization, A.E.G.I.S., the threat is known, and it is up them and their special powered "Gate Keepers" to stop this invasion.
| 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 | Junichi Sato | Director |
| Writing | Hiroshi Yamaguchi | Original Story |
| Writing | Hiroshi Yamaguchi | Writer |
