Cast
Edward Van Sloan
Professor Bostwick
Doris Lloyd
Lucille Coates
Broderick O'Farrell
Dr. Howell
Robert Warwick
Joseph Harris
Charles Starrett
Kenneth 'Ken' Harris
Helen Jerome Eddy
Miss Lottie Case
Eddie Tamblyn
Bill Smart
Julian Madison
Charlie Penlon
John Davidson
Professor Brand
Herbert Bunston
College Professor
Robert McKenzie
Sheriff Graves, Sheriff
Jane Keckley
Bostwick's Housekeeper
Eric Mayne
Professor at Service (Uncredited)
Marion Shilling
Jean Coates
James Bush
Byron Coates / John Meseraux
George Morrell
Deputy Ab Barber