Jacques Bergerac

Desmond

Merry Anders

Dodie Wilson

Marcia Henderson

Marcia Blaine

Allison Hayes

Justine

Joe Patridge

Det. Sgt. Dave Kennedy

Fred Demara

The Great Impostor

Lawrence Lipton

Beatnik Poet Laureate

Eric Nord

King of the Beatniks (as Eric 'Big Daddy' Nord)

Guy Prescott

Dr. Philip Hecht

Jimmy Lydon

Emergency Doctor (as James Lydon)

Carol Thurston

Doris Scott

Eva Lynd

Woman from Audience

Don Ames

Audience Member (uncredited)

Eddie Baker

Observer at Scene (uncredited)

Nina Borget

Audience Member (uncredited)

George Blair