James Mason
Self - Host / Captain Vialez

John Doucette
/ Chuck Nolan / Capt. Jerry Comstock / Bouclet / Jim Tally / Matt Kovacs / Fall...

Walter Coy
/ Warden Carmody / Comm. Fred Eggly / Capt. Phillips / Corton / Haven / Paul Hu...

John Bryant
Paul Chalmers / Sam Gates / Tony Savage / Lt. Lyle Smith / Robert / Lt. Harry Ry...

Diana Lynn
/ Bonnie Brewster

John Ireland
/ Andrew Evans / Billy Bob Jackson / Jim Regan / Pete Bronson

Arthur Franz
/ Steve Jordan / Sgt. Douglas Renfrew / Chris Mather / Chris Grine / Larry Flem...

Barbara Billingsley
/ Clare Gibney / Ellen / Olivia Bryant / Ruth Curtis

Skip Homeier
Dick Newton / Stretch / Paddy / Mark Norton / Slim Haskell / Zakka

Margaret Field
Renee Beddoe / Carla / Laura Warren / Lola / / Denise

Hayden Rorke
/ Albert Cook / Pastor Thompson / John Whitlock / Brian Levering

Scott Brady
/ Officer Jim Kovacs / Calvin Penny / Shotgun Slade / Reno Cromwell

Katherine Warren
/ Louise / Miss Dennis - Teacher / Mrs. Gunther

Edmond O'Brien
/ Rick Saunders / Capt. Simpson / Jim Reardon

Paul Brinegar
/ Joe / Brown / Cousin Obie (uncredited) / Link

Phyllis Avery
/ Susan Kerney / Mrs. McNulty / Betty Matthews

Richard Carlson
Lawrence 'Larry' Cameron / Alan Mitchell / Josef Lindquist / / Kelly McCall

Hans Conried
Warren Fitzjerner / / Professor Greentree / Professor / Emory Caldwell

Vincent Price
Narrator / Wendell Bensen / An Artist / Baron Laval aka Aristide Pujol / / Swed...

Stephen McNally
Lt. Al Merrit / Tom Novak / Pvt. Earl Webb / Frank Dyson / Police Chief Dan Grab...