The battle for Earth will be decided between Ambassador Magma, a super-powered, golden giant, and Goa, an evil, alien mastermind; adapted from the manga by Osamu Tezuka.

The battle for Earth will be decided between Ambassador Magma, a super-powered, golden giant, and Goa, an evil, alien mastermind; adapted from the manga by Osamu Tezuka.

The battle for Earth will be decided between Ambassador Magma, a super-powered, golden giant, and Goa, an evil, alien mastermind; adapted from the manga by Osamu Tezuka.

The battle for Earth will be decided between Ambassador Magma, a super-powered, golden giant, and Goa, an evil, alien mastermind; adapted from the manga by Osamu Tezuka.

The intelligence agency that controls Mamoru has already succeeded in contacting the Goa camp; Mamoru escapes from the agency, but his life is threatened by assassins; a blue glow saves him which turns out to be Gam, the human rocket.

Magma hurries to the Pacific Ocean to aid a ship, but discovers it was a trap; a tidal wave caused by his struggle heads for the metropolitan area; Kunisaki tells Mamoru that Magma is the devil planning to invade the planet.