Evelyn Ankers

Beth Mason

J. Carrol Naish

Dr. Carl Fletcher

Samuel S. Hinds

Coroner

Lois Collier

Joan Fletcher

Milburn Stone

Fred Mason

Douglass Dumbrille

District Attorney

Acquanetta

Paula Dupree, the Ape Woman

Nana Bryant

Miss Gray

Pierre Watkin

Dr. Meredith

Christian Rub

George

Alec Craig

Caretaker

Tom Keene

Joe, the Fingerprint Man

Vince Barnett

Curley (archive footage / uncredited)

Clyde Beatty

Fred Mason (in long shots) (archive footage / uncredited)

John Carradine

Dr. Sigmund Walters (archive footage / uncredited)

Heinie Conklin

Inquest Juror (uncredited)

Ray Corrigan

Cheela (archive footage / uncredited)

Fern Emmett

Beth's Neighbor (archive footage / uncredited)

Nolan Leary

Inquest Juror (uncredited)

Beatrice Roberts

Inquest Juror (uncredited)

Ray Walker

Ringmaster (archive footage / uncredited)