Planet of Origin: Jupiter
The Jovians are sentient heavy and scaly reptilian humanoid which seem to have developed a civilisation in zones of the planet Jupiter where life could emerge.
Men of Jupiter action figures where commercialised in the sixties. Their story was told at the back of their blisterpack:
From the huge red spot near the equator of the giant planet Jupiter, a great ship travels forth. On board is the mighty warrior Colossus Rex, strongest of the strong. The colossal strenght needed merely to survive the crushing pressure of the atmosphere and enormous force of gravity on his native Jupiter make him a veritable superman on other worlds. Invulnerable to attacks, invincible in battle, brute strenght is his only weapon. Yet no power in the galaxy can defeat him. We hope his mission is only to explore the universe and not conquer it.
Source: Mel Birnkrant, The Outer Space Men – also known as the Colorform Aliens, 1968.