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

Eddie Baker
Observer at Scene (uncredited)

Nina Borget
Audience Member (uncredited)

Phyllis Cole
Mrs. McNear (uncredited)

Franklyn Farnum
Audience Member (uncredited)

Mary Foran
June Mayes (uncredited)

George Ford
Audience Member (uncredited)

Holly Harris
Mrs. Stevens (uncredited)

Kenner G. Kemp
Audience Member (uncredited)