The anime aired on Japanese TV from April 15, 1984 (1984-04-15) to September 30, 1984 (1984-09-30) in the network Nippon Television with 23 episodes.

A Japanese teen named Yamato Hino, a young sports enthusiast, during a quiet and ordinary day begins to feel strange calls from an indefinite dimension.

Frightened and confused, the boy thinks that he had hallucinations but during a thunderstorm a lightning bolt drags him into a parallel world: the ancient kingdom of Mu, ruled by King Muraji whose concern is to defend the capital of his kingdom, attacked by monsters commanded by the evil Dorado of the Empire of Dinosaurs.

In the kingdom of Mu, a legend tells of a titanic being that stands ready to defend the population from any threat and the king wants to awaken the giant statue of the god Mazinger; to do this he needs a brave boy whose name is Yamato, the only one capable of awakening the mighty giant.

The devout prayers of the king and the princess are heard: the boy arrives to the dimension of Mu and the statue suddenly becomes alive.

When the monsters of Dorado broke through the defenses of the kingdom, God Mazinger defeats the dinosaurs and makes the enemy army flee.

The first time in June 25, 2003 (2003-06-25) by Pioneer LDC (standard number PIBA-3157) as a DVD-box set with the full series.

[24][25] US publisher Discotek Media will release the series with English subtitles on SD Blu-ray on January 28, 2020 (2020-01-28).