Kress starts gathering humanoid slaves using his robot army to sell them to his evil counterparts.

Defending "Sol 3" against the new owner is the kindly Professor Maury and his ragtag band of human, one of which wears a Spider-Man t-shirt, and robot friends.

Their plan is to destroy the metal of the alien ship, called Iridium (or etherium) after discovering its weakness.

This is the fourth and final film in Alfonso Brescia's sci-fi series, with the others being Cosmos: War of the Planets (a.k.a.

"Worst Movies Ever Made" found the effects to be laughable and the story confused at best.