Boris Karloff
Dr. Bernard Adrian

Maris Wrixon
Frances Clifford

Gene O'Donnell
Danny Foster

Dorothy Vaughan
Mother Clifford

Henry Hall
Sheriff Jeff Halliday

Selmer Jackson
Dr. McNulty

Gertrude Hoffmann
Jane the Housekeeper

Jessie Arnold
Mrs. Brill

Billy Bletcher
Short Mustached Posse Man

Harry C. Bradley
Quinn

George Cleveland
Mr. Howley

Ray Corrigan
Nabu

Pauline Drake
Young Girl

Mary Field
Mrs. Mason

Gibson Gowland
Posse Member

Julia Griffith
Townswoman

I. Stanford Jolley
Ape Trainer

Jack Kennedy
Dep. Archie Tomlin

Donald Kerr
Citizen Carrying Mauled Ape Trainer

Philo McCullough
Henry Mason