タイムトラベルが可能になった2001年、突如日本各地に異常現象が発生! それは恐竜たちが栄える時代・白亜紀からの攻撃だった。恐竜の時代に侵略を始める、宇宙からの侵略者ゴドメス星人。白亜紀を調査するタイムGメン・コセイドン隊。真紅の強化服に身を包む正義の戦士・コセイダーと共に、コセイドン隊がゴドメス星人に立ち向かう!

Dinosaur Corps Koseidon (恐竜戦隊コセイドン Kyōryū Sentai Koseidon) is a Japanese tokusatsu superhero science fiction adventure television series produced by Tsuburaya Productions in two seasons aired from July 7, 1978 to June 29, 1979. The series lasted for a total of 52 episodes. The series told the adventures of Go, a superhero leading a patrol who travel in time to defeat the Godmess Empire (ごどめす せいじん Godomesu Seijin), an alien armada who, after landing on Earth 70 million years ago, has altered the course of time. Go's enemies include dinosaurs which are telepathically controlled by the aliens. He has the ability to stop time for 30 seconds. Koseidon is the name allowing Go and his mates to time travel.