Steve Benton
Ken Clark
Liz Walker
Yvette Vickers
Sam Peters (uncredited)
Joseph Hamilton
Mike (uncredited)
Walter Kelley
Search Party Member (uncredited)
Bill Scully
Carl Sklover
Giant Leech (uncredited)
Ross Sturlin
Jermey (uncredited)
James Miller
Victim (uncredited)
Killian Miller
Nan Greyson
Jan Shepard
Cal Moulton
Michael Emmet
Doc Greyson
Tyler McVey
Dave Walker
Bruno VeSota
Sheriff Kovis
Gene Roth
Porky Reed
Dan White
Lem Sawyer
George Cisar
Guy Buccola
Executive Producer
Roger Corman
Screenplay
Leo Gordon
Original Story
Director
Bernard L. Kowalski
Producer
Gene Corman
Director of Photography
John M. Nickolaus Jr.
Editor
Carlo Lodato
First Assistant Camera
Charles Rosher Jr.
Production Manager
Jack Bohrer
Sound
Al Overton
Property Master
Richard M. Rubin
Production Secretary
Kinta Zertuche
Art Direction
Daniel Haller
Original Music Composer
Alexander Laszlo
Associate Editor
Anthony Magro