Mars is dying due to reasons, the Martian Dop (Tommy Kirk) leads a team to Earth to find some suitable fertile females for breeding purposes. Dop announces this plan to the US military beforehand for some reason. Dop and his team begin selecting suitable females. Pole dancers and flight attendants seem to be the preferred choice (natch).
However, Dop selects the female scientist Dr Bolen (Yvonne Craig) for his target and falls in love with her. The authorities are meanwhile searching high and low for the Martians...
This is a pretty awful film to be honest. The overall premise is sound perhaps though crudely implemented and overall the film is pretty sleazy and cheap. The story makes little sense of course and often is (unintentionally) hilarious.