Chester Morris
Dr. Carlo Lombardi
Marla English
Andrea Talbott / Elizabeth Wetherby
Tom Conway
Timothy Chappel
Cathy Downs
Dorothy Chappel
Lance Fuller
Dr. Ted Erickson
Ron Randell
Police Lt. Ed James
Frieda Inescort
Mrs. Chappel
Frank Jenks
Plainclothes Sgt. with Lt James
El Brendel
Olaf, the butler
Paul Dubov
Johnny, the barker
William Hudson
Bob, the ex-fiancé
Flo Bert
Marta, the Maid
Jeanne Evans
Mrs. Brown
Kenneth MacDonald
Police Doctor with Prof. Anderson
Jack Mulhall
Lombardi's Lawyer
Edward Earle
Professor Anderson
Bess Flowers
Party Guest
Paul Blaisdell
The She-Creature
Spike
King the Dog