This television mecha-genre anime is loosely based on the 1976 Mars (マーズ, Māzu) manga from Weekly Shōnen Champion magazine by Mitsuteru Yokoyama.

The small planet Gishin, led by Emperor Zul, who aims to conquer the galaxy, runs into conflict with Earth which he targets for elimination and to do this, he sends a male baby named Mars to live among humanity.

Accompanying the baby is a giant robot named Gaia, which utilizes a new power source strong enough to destroy an entire planet.

17 years later after arrival, Takeru matures with a love for humanity and refuses to detonate the bomb as ordered by his sender, Zul.

[1] God Mars came out very early in the super robot animation era of the 1980s, having been created by Mitsuteru Yokoyama and did very well in airing.