Earth is under alien attack! Thousands of years ago, the people of the planet Zela uplifted the cultures of Earth with advanced alien science and technology. Now, with Zela itself in danger of being dragged into a black hole, the supercomputer Emperor Darius wants to find salvation for his people... by taking our planet for himself!
 
The only ones who can stop Darius' total conquest are the carrier superweapon Daiku Maryu and its intrepid but eclectic crew: an American navy pilot, a sumo wrestler, a kickboxing champion, and a host of other psychic misfits. The newest addition to the team is a brash baseball player named Sanshiro Tsuwabuki, whose arm was damaged in a Zelan attack, and now seeks revenge at the helm of the giant super robot Gaiking!
 
(Source: Discotek Media)

A boy, Tsuwabaki Daiya found a black fire in an ocean when he and his father were in a small boat. A big monster came out of the fire, and the father and the crews were disappeared into the sea. When he was about to become the next victim, a large mecka dragon appeared and saved him. 
5 years later since then, Daiya becomes a junior high school student. A big monster reappear, and he meets the mecha dragon,"Daiku Maryu". The head of the dragon separates from the body, and it turns into the body of a super robot, Gaiking. He gets in Gaiking, fights against the monster, and beats it. 
He learns that there is an enemy that plots to conquer the world, and he leaves for another world, Darius, to stop the plot. 
(Source: AnimeNfo)

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