The Great Impostor

Tony Curtis

Ferdinand Waldo Demara Jr. / Martin Donner / Dr. Gilbert / Ben. W. Stone / Dr. Joseph Mornay / Robert Boyd Hammnd

Karl Malden

Father Devlin

Edmond O'Brien

Capt. Glover - HMCS Cayuga

Arthur O'Connell

Warden J.B. Chandler

Gary Merrill

Pa Demara

Joan Blackman

Lt. Catherine Lacey

Raymond Massey

Abbott Donner

Robert Middleton

R.C. Brown

Jeanette Nolan

Ma Demara

Sue Ane Langdon

Eulalie Chandler

Larry Gates

Cardinal

Mike Kellin

Clifford Thompson

Frank Gorshin

Barney

Cindi Wood

WAC Lieutenant

Dick Sargent

Hotchkiss

Robert Crawford Jr.

Fred Demara Jr. (as Robert Crawford)

Doodles Weaver

Farmer Hauling Fertilizer

Ward Ramsey

Lieutenant Commander Howard - HMCS Cayuga

David White

Dr. Hammond

Philip Ahn

Capt. Hun Kim

Herbert Rudley

Senior Officer

Jerry Paris

Defense Lieutenant

Harry Carey, Jr.

Dr. Joseph Mornay

Willard Sage

Lt. Thornton

Russ Conway

Sgt. Wilkerson (uncredited)

James Dobson

Sailor (uncredited)

Richard Gaines

State Official (uncredited)

Bob Herron

Highway Patrol Officer (uncredited)

Herbert Lytton

Reporter (uncredited)

Frank Maxwell

Tirdell (uncredited)

Michael Ford

Soldier (uncredited)

Dan Sheridan

RCN Chief (uncredited)

Charles Cane

Sheriff (uncredited)

Gage Clarke

Mr. Warren (uncredited)

John Cliff

Marine Major (uncredited)

Robert Dornan

Reporter (uncredited)

James Drake

Seaman (uncredited)

Bob Hastings

State Department Official (uncredited)

Dale Ishimoto

Korean Soldier (uncredited)

Robert Kino

Korean Officer (uncredited)

Ted Knight

Reporter (uncredited)

Oliver McGowan

RCN Commander (uncredited)

Don Ross

Sergeant (uncredited)

Paul Sorensen

Guard (uncredited)

Tom Steele

Highway Patrol Officer (uncredited)

Warren Vanders

Minor Role (uncredited)