The Gorilla Man

Captain Craig Killian

Janet Devon

Patricia 'Pat' Devon

Lieutenant Walter Sibley

Dr. Dorn

General Randall Devon

Dr. Ferris

Nurse Kruger

Eric - Male Nurse

Mrs. Ellen Tanner

Inspector Cady

Marie Oliver - the Maid

Sammy

Constable Fletcher

Constable Ryan

Landlady (uncredited)