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.

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.

A small town doctor mistakenly ingests an experimental drug made from the blood of vampire bats which transforms the kindly medic into a bloodthirsty monster.