The Ape

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