Created by Osamu Tezuka, Ambassador Magma ran from July 4th 1966 to September 25th 1967, with a total of 52 episodes. It was the first color tokusatsu TV series in Japan, beating Ultraman to the airwaves by 6 days.
The plot revolves around an alien invader named Goa who wants to conquer the Earth. He first warns the Murakami family (father Atsushi, mother Tomoko, and son Mamoru) of their invasion, and demonstrates his powers by transporting them to a prehistoric jungle and destroying a Giant Dinosaur before their very eyes. They refuse to surrender to Goa.
Hope arrives in the form of Magma, an armored, golden giant with long hair and antennae. He and his human-sized wife Mol, both created by the wizard Earth (who lives deep beneath the Earth), are sent to defend our world against Goa. They befriend Atsushi and Mamoru; the latter has touched Magma emotionally, as he wanted to have a child with his wife Mol, so Earth creates a duplicate of Mamoru, named Gam (who wears a helmet with antennas). Earth gives Mamoru a whistle, with which he can call Gam (when blown once), Mol (when blown twice) and Magma (when blown thrice) in times of crisis. So when Goa unleashes his various daikaiju, chances are, Magma, Mol, and Gam will fly to the rescue.