Killer Karl
Sheriff Frank Huston (as William H. Bassett)
Mother Firefly
Denise Willis
Gerry Ober
Skunk Ape Wife
Grampa Hugo
Dr. Wolfenstein
Steve Naish
Captain Spaulding
Jerry Goldsmith
Skunk Ape Husband
Mary Knowles
Ravelli
Tiny Firefly
The Professor
Baby Firefly (as Sheri Moon)
Otis
Lewis Dover
Rufus (as Robert Mukes)
Dr. Satan
Stucky
Richard Wick
Detective George Wydell
Bill Hudley
Don Willis
Mental Patient (uncredited)
Sex slave (uncredited)
Tow Truck Driver (uncredited)
Dr. Wolfenstein's assistant (uncredited)