James Mason
Self - Host / Captain Vialez

John Doucette
/ Matt Kovacs / Chuck Nolan / Jim Tally / Fallon / Bouclet / Capt. Jerry Comsto...

John Bryant
Pete / Sam Gates / Paul Chalmers / Lt. Harry Ryan / Tony Savage / Patrolman Kenn...

Diana Lynn
/ Bonnie Brewster

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

Arthur Franz
/ Sgt. Douglas Renfrew / Chris Grine / Larry Fleming / Chris Mather / Steve Jor...

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

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

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

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

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

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

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

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

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

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

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

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

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

Paul Langton
Landry / Mal Martin / Stacey Harris / Cochran / Pete Hunter