In the 24th century, a post-apocalyptic Earth is a penal colony, where a convict (Xavier Declie) must find and rescue a planetary-federation leader (Richard Herd) whose ship has crashed., Humans, apparently, were originally bred billions of years ago as slaves to an alien race. The aliens eventually went away, but one — who was frozen in the Arctic after crashing its ship — thaws out and is out to finish the job his colleagues started.