Five years ago, the young Daiya Tsuwabuki and his father were involved in an accident that destroyed their ship and caused Daiya’s father to disappear. Though Daiya claimed that the accident was the result of an attack by giant monsters, he was ridiculed for his belief. Now, in the present, the same monsters have emerged and attack Daiya’s home island; and when Daiya single-handedly faces them, he runs across a flying dragon-shaped battleship named Daiku-Maryu and joins its crew as the pilot of the super robot Gaiking. Along with the Daiku-Maryu, Daiya sets forth to the inner hidden world of Darius to find his father, and put a stop to the Darius Emperor’s evil schemes.
Professor Saotome is finishing up his lifelong Getter project: a series of space exploration ships powered by Getter rays from the sun. These ships are able to combine into three different robot forms called Getter Robo. At the same time, King Gora of the underground Dinosaur Empire has completed his mechasaurus project and begins his plans for world domination! Can Getter Robo’s pilots Ryoma, Hayato and Musashi defend the earth from the forces of the Dinosaur Empire, even with the help of the lovely Michiru from the Command Ship?