Series Episodes
Dinosaur Sentai Koseidon
Dinosaur Sentai Koseidon is the 3rd entry in the Tsuburaya Dinosaur Trilogy
Kosideon title card
Format: TV Drama
Created by: Tsuburaya Productions
Starring: Tetsuya Onishi
Sankei Keiji
Miyu Ichijo Nozomi
Takako Kawasaki
Nanami Murano
Sato GaJiro
Kusano Daigo
Hiroyuki Kumagai
Michiko Nagahama
Hideo Kanze
Opening Theme: "Dinosaur Sentai Koseidon"
Ending Theme: "Koseidon Corps March"
Country Of Origin Japan
Number Of Episodes 52
Running Time approx. 30 minutes
Original Channel Tokyo 12
Original Air Date July 7, 1978 - June 29, 1979
Preceded by Trilogy: Dinosaur Great War Izenborg
Succeeded by Production: The☆Ultraman

Dinosaur Squadron Koseidon (恐竜戦隊コセイドン Kyōryū sentai koseidon?) was a 1978 tokusatsu series created by Tsuburaya Productions. Although not the official title, after the 41st episode of the series during airing, the shows title name changed to Dinosaur Sentai Koseidon Fight Human Cannon Kosaider ( 恐竜戦隊コセイドン 戦え 人間大砲コセイダー Kyōryū sentai koseidon tatakae ningen taihō koseidā?)


  • Toki Gow / Koseida: Tetsuya Onishi
  • Himugashi iron: Sankei Keiji
  • Butsukusa-Urara: Miyu Ichijo Nozomi (up to beginning the first 14 episodes)
  • Haruna Mari: Takako Kawasaki (up to the first 28 episodes, finale)
  • Arutashiya: Nanami Murano
  • Mori Moryi: Sato GaJiro
  • Banno - Power: Kusano Daigo
  • Tachibana Mitsuru: Hiroyuki Kumagai (up to Episode 6)
  • Tachibana Lina: Michiko Nagahama (up to Episode 6)
  • Kaido space-time management Secretary: Hideo Kanze


Set in the future where time travel is made possible through the discovery of Tachyon, a particle that moves faster that light, humanity can freely go back and forth between the Mesozoic, Cretaceous and the present, making colonies on Cretaceous earth. The Time Dimension Control Bureau boasts a special team, the Time G Men · Koseidon Corps, driving the huge time machine Koseidon. They protect the safety of Cretaceous and time travel.

In 2001 , Japan was attacked by heat rays and freeze rays, and it turns out that the attack is from the Cretaceous. In response to this abnormal situation, Koseidon requested by the Time Dimension Control Bureau and started investigation in Cretaceous. They encounter a fugitive from outside the Earth -- Princess Altasiya and her robot Bikuraji. The invader Alien Godomess set their sights on Earth as an invasion target and the Koseidon troops will fight to stop the invasion of the Earth.


  • "Dinosaur Sentai Koseidon" performed by Ichiro Mizuki
  • "Koseidon Corps March" performed by Ichiro Mizuki
Shows and Films
Showa Series

Ultra Q | Ultraman | Ultra Seven | The Return of Ultraman | Ultraman Ace | Ultraman Taro | Ultraman Leo | The☆Ultraman | Ultraman 80

First phase of Heisei Series

Ultraman Tiga | Ultraman Dyna | Ultraman Gaia

Second phase of Heisei Series

Ultraman Cosmos | Ultra Q: Dark Fantasy | Ultraman Nexus | Ultraman Max | Ultraman Mebius | Ultraseven X | Ultra Galaxy Mega Monster Battle | Ultra Galaxy Mega Monster Battle: Never Ending Odyssey | Ultraman Retsuden | Neo Ultra Q | Shin Ultraman Retsuden | Ultraman Ginga | Ultraman Ginga S | Ultraman X | Ultraman Orb | Ultraman Zero: The Chronicle | Ultraman Geed

Outside of Japan

Ultraman: The Adventure Begins | Ultraman: Towards the Future | Ultraman: The Ultimate Hero


Ultra Fight | Ultraman vs. Kamen Rider | Ultraman Nice | Heisei Ultraseven | Ultraman Neos | Ultra Idemitsujin | Ultra Zone | Ultra Zero Fight | Ultra Fight Victory | Ultraman Orb THE ORIGIN SAGA | Ultra Fight Orb

Showa Movies

Ultraman: Monster Movie Feature | Ultraman, Ultraseven: Great Violent Monster Fight | Ultraman: Great Monster Decisive Battle | Ultraman (1979 film) | Zoffy: The Ultra Warriors Vs The Giant Monster Army | Ultraman Story

Heisei Movies

Ultra Q The Movie | Ultraman Zearth | Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow | Revive!:Ultraman | Ultraman Tiga & Ultraman Dyna: Warriors of the Star of Light | Ultraman Tiga & Ultraman Dyna & Ultraman Gaia: Battle in Hyperspace | Ultraman Tiga: The Final Odyssey | Ultraman Cosmos: The First Contact (2001) | Ultraman Cosmos: The Blue Planet (2002) | Ultraman Cosmos Vs Ultraman Justice: The Final Battle | Ultraman The Next | Ultraman Mebius & The Ultra Brothers | The Super 8 Ultra Brothers | Mega Monster Battle: Ultra Galaxy Legend The Movie | Ultraman Zero The Movie: The Revenge of Belial | Ultraman Saga | Ultraman Ginga S The Movie: Showdown! The 10 Ultra Warriors! | Ultraman X The Movie: Here Comes! Our Ultraman | Ultraman Orb The Movie: Lend Me The Power of Bonds!

Other Series

Captain Ultra | Mighty Jack | Mirrorman | Redman | Triple Fighter | Iron King | Fireman | Jumborg Ace | Mirror Fight | Pro-Wres no Hoshi Azteckaiser | Dinosaur Expedition Born Free | Dinosaur War Aizenborg | Dinosaur Squadron Koseidon | Denkou Choujin Gridman | Mirrorman REFLEX | Bio Planet WoO | Mirror Fight 2012

Ultraman Kids | Ultraman Graffiti: Wild! Ultra Country | Ultraman: Super Fighter Legends | Ultra Nyan | Denkou Choujin Gridman: Boys Invent Great Heroes | The・Ultraman: Jackal vs. Ultraman | Kaiju Sakaba Kanpai!

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