A misguided scientist enables an alien from Venus named Zontar to come to earth in order to "help solve man's problems". However, as soon as Zontar arrives on Earth, it quickly becomes obvious that the three-eyed, bat-winged, skeletal black creature has a hidden agenda.

A government space experiment into the effects of cosmic rays on animal life goes horribly wrong, creating a mutant monster that terrorizes a rural community.

A Nazi scientist invents a time machine enabling him to go back to alter the events of WWII.