James Mason
Self - Host / Captain Vialez

John Doucette
/ Matt Kovacs / Chuck Nolan / Fallon / Capt. Jerry Comstock / Jim Tally / Boucl...

Walter Coy
/ Paul Hunter / Comm. Fred Eggly / Haven / Capt. Phillips / Corton / Warden Car...

John Bryant
Sam Gates / Lt. Lyle Smith / Lt. Harry Ryan / Paul Chalmers / Pete / Tony Savage...

Diana Lynn
/ Bonnie Brewster

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

Arthur Franz
/ Chris Grine / Steve Jordan / Larry Fleming / Sgt. Douglas Renfrew / Chris Mat...

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

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

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

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

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

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

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

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

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

Carl Benton Reid
/ Admiral / Arthur Kerney

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

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

Vincent Price
Swede / An Artist / Narrator / Wendell Bensen / / Baron Laval aka Aristide Pujo...