The story revolves around Duke Fleed who is a survivor of the Vega Star, raised by Dr. Umon as his adoptive son, and known as Daisuke Umon on Earth. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his kid sister Maria Grace), Duke decides to fight back using his best weapon, the almighty Grendizer.
You can now watch UFO Robot Grendizer online on the following streaming providers in the United States.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Brothers of the Universe | 1975-10-05 | 25 min |
| Season 1 | Episode 2 | Prince of the Other World | 1975-10-12 | 25 min |
| Season 1 | Episode 3 | The Tragic Fiesta | 1975-10-19 | 25 min |
| Season 1 | Episode 4 | The Island of Fear | 1975-10-26 | 25 min |
| Season 1 | Episode 5 | The Pitfall of Death | 1975-11-02 | 25 min |
| Season 1 | Episode 6 | Attack on Perlepolis | 1975-11-09 | 25 min |
| Season 1 | Episode 7 | The Feast of the Wolves | 1975-11-16 | 25 min |
| Season 1 | Episode 8 | The Radars Are Off | 1975-11-23 | 25 min |
| Season 1 | Episode 9 | The Black Moon Camp | 1975-11-30 | 25 min |
| Season 1 | Episode 10 | Vega's Spy | 1975-12-07 | 25 min |
| Season 1 | Episode 11 | The Day When the Sun Will Stop | 1975-12-14 | 25 min |
| Season 1 | Episode 12 | Blood on Snow | 1975-12-21 | 25 min |
| Season 1 | Episode 13 | By Iron and by Fire | 1975-12-28 | 25 min |
| Season 1 | Episode 14 | The Day of the Rising Sun | 1976-01-04 | 25 min |
| Season 1 | Episode 15 | Red Akerae | 1976-01-11 | 25 min |
| Season 1 | Episode 16 | The Fiancé of Death | 1976-01-18 | 25 min |
| Season 1 | Episode 17 | The Infernal Ride | 1976-01-25 | 25 min |
| Season 1 | Episode 18 | The New Time of the Caves | 1976-02-01 | 25 min |
| Season 1 | Episode 19 | The Crushed Town | 1976-02-08 | 25 min |
| Season 1 | Episode 20 | Earth in Danger | 1976-02-15 | 25 min |
| Season 1 | Episode 21 | The Submerged Continents | 1976-02-22 | 25 min |
| Season 1 | Episode 22 | The Slayers of the Sky | 1976-02-23 | 25 min |
| Season 1 | Episode 23 | The Flood of the New Worlds | 1976-03-05 | 25 min |
| Season 1 | Episode 24 | The Enforcer | 1976-03-12 | 25 min |
| Season 1 | Episode 25 | Fleed's Lovers | 1976-03-19 | 25 min |
| Season 1 | Episode 26 | The Edges of the Abyss | 1976-03-26 | 25 min |
| Season 1 | Episode 27 | Win or Perish | 1976-04-04 | 25 min |
| Season 1 | Episode 28 | The New Masters of Darkness | 1976-04-11 | 25 min |
| Season 1 | Episode 29 | The Fire Bird | 1976-04-18 | 25 min |
| Season 1 | Episode 30 | The Lightning Rock | 1976-04-25 | 25 min |
| Season 1 | Episode 31 | A Dreamer from Outer-Space | 1976-05-02 | 25 min |
| Season 1 | Episode 32 | The Ghost Queen | 1976-05-09 | 25 min |
| Season 1 | Episode 33 | The Wings of Death | 1976-05-16 | 25 min |
| Season 1 | Episode 34 | The Mercenary of Oppression | 1976-05-23 | 25 min |
| Season 1 | Episode 35 | The First Raid | 1976-05-30 | 25 min |
| Season 1 | Episode 36 | The Invincible Cosmos | 1976-06-06 | 25 min |
| Season 1 | Episode 37 | The Patrol of Eagles | 1976-06-27 | 25 min |
| Season 1 | Episode 38 | A Star Is Dead | 1976-06-13 | 25 min |
| Season 1 | Episode 39 | Darkness Makers | 1976-06-20 | 25 min |
| Season 1 | Episode 40 | The Awakening of Volcanoes | 1976-07-04 | 25 min |
| Season 1 | Episode 41 | Baptism of Fire | 1976-07-11 | 25 min |
| Season 1 | Episode 42 | Peril in Abode | 1976-07-18 | 25 min |
| Season 1 | Episode 43 | The Victory of Eagles | 1976-07-25 | 25 min |
| Season 1 | Episode 44 | When Dogs Are Loosened | 1976-08-01 | 25 min |
| Season 1 | Episode 45 | Ants and Men | 1976-08-08 | 25 min |
| Season 1 | Episode 46 | The Ballet of Sharks | 1976-08-15 | 25 min |
| Season 1 | Episode 47 | The Ignited Lake | 1976-08-22 | 25 min |
| Season 1 | Episode 48 | World in Fusion | 1976-08-29 | 25 min |
| Season 1 | Episode 49 | The Last Survivor | 1976-09-05 | 25 min |
| Season 1 | Episode 50 | The Four-Headed Eagle | 1976-09-12 | 25 min |
| Season 1 | Episode 51 | The Black Star | 1976-09-19 | 25 min |
| Season 1 | Episode 52 | The Generation of Monsters | 1976-09-26 | 25 min |
| Season 1 | Episode 53 | The Beast | 1976-10-03 | 25 min |
| Season 1 | Episode 54 | The Snake | 1976-10-10 | 25 min |
| Season 1 | Episode 55 | The Loch Ness Monster | 1976-10-17 | 25 min |
| Season 1 | Episode 56 | The Lynx of Outer-Space | 1976-10-24 | 25 min |
| Season 1 | Episode 57 | The Monster and the Child | 1976-10-31 | 25 min |
| Season 1 | Episode 58 | The Lookalike | 1976-11-07 | 25 min |
| Season 1 | Episode 59 | The Commando | 1976-11-14 | 25 min |
| Season 1 | Episode 60 | Rats | 1976-11-21 | 25 min |
| Season 1 | Episode 61 | Pegasus | 1976-11-28 | 25 min |
| Season 1 | Episode 62 | Swans | 1976-12-05 | 25 min |
| Season 1 | Episode 63 | The Polar Bear | 1976-12-12 | 25 min |
| Season 1 | Episode 64 | 5 Minutes to Die | 1976-12-19 | 25 min |
| Season 1 | Episode 65 | A Great Between the Greats | 1976-12-26 | 25 min |
| Season 1 | Episode 66 | Death Comes from the Sea | 1977-01-02 | 25 min |
| Season 1 | Episode 67 | Diving Operation | 1977-01-09 | 25 min |
| Season 1 | Episode 68 | The Great Pain | 1977-01-16 | 25 min |
| Season 1 | Episode 69 | Like Father, Like Son | 1977-01-23 | 25 min |
| Season 1 | Episode 70 | The Imposter | 1977-01-30 | 25 min |
| Season 1 | Episode 71 | Best Friend | 1977-02-06 | 25 min |
| Season 1 | Episode 72 | Princess in Love | 1977-02-13 | 25 min |
| Season 1 | Episode 73 | For the Love of Earth | 1977-02-20 | 25 min |
| Season 1 | Episode 74 | This Is Not Goodbye | 1977-02-27 | 25 min |
| Production | Chiaki Imada | Producer |
| Writing | Keisuke Fujikawa | Writer |
| Writing | Go Nagai | Writer |
| Writing | Mitsura Majima | Writer |
| Writing | Shozo Uehara | Writer |
