Vince Hackett's gang steals a prized victory canon from Mexico and blames the deed on ex-member Jess Wade, who wants to go straight.

Humanoid killer robots stalk a newspaperman, who has knowledge of their existence. One of the robots is made to look like his girl friend.

When master monster make-up man Pete Dumond is fired by the new bosses of American International studios, he uses his creations to exact revenge.