 Evelyn AnkersBeth Mason | Beth Mason |
 J. Carrol NaishDr. Carl Fletcher | Dr. Carl Fletcher |
 Samuel S. HindsCoroner | Coroner |
 Lois CollierJoan Fletcher | Joan Fletcher |
 Milburn StoneFred Mason | Fred Mason |
 Douglass DumbrilleDistrict Attorney | District Attorney |
 AcquanettaPaula Dupree, the Ape Woman | Paula Dupree, the Ape Woman |
 Nana BryantMiss Gray | Miss Gray |
 Pierre WatkinDr. Meredith | Dr. Meredith |
 Christian RubGeorge | George |
| RRichard DavisBob Whitney | Bob Whitney |
| EEdward M. Hyans Jr.Willie | Willie |
 Alec CraigCaretaker | Caretaker |
 Tom KeeneJoe, the Fingerprint Man | Joe, the Fingerprint Man |
 Vince BarnettCurley (archive footage / uncredited) | Curley (archive footage / uncredited) |
 Clyde BeattyFred Mason (in long shots) (archive footage / uncredited) | Fred Mason (in long shots) (archive footage / uncredited) |
| WWilson BengeCourt Stenographer (uncredited) | Court Stenographer (uncredited) |
 John CarradineDr. Sigmund Walters (archive footage / uncredited) | Dr. Sigmund Walters (archive footage / uncredited) |
| DDiane CarrollInquest Juror (uncredited) | Inquest Juror (uncredited) |
| EEdward ClarkInquest Juror (uncredited) | Inquest Juror (uncredited) |
 Heinie ConklinInquest Juror (uncredited) | Inquest Juror (uncredited) |
 Ray CorriganCheela (archive footage / uncredited) | Cheela (archive footage / uncredited) |
 Fern EmmettBeth's Neighbor (archive footage / uncredited) | Beth's Neighbor (archive footage / uncredited) |
 Nolan LearyInquest Juror (uncredited) | Inquest Juror (uncredited) |
| CCharles MarshInquest Juror (uncredited) | Inquest Juror (uncredited) |
 Beatrice RobertsInquest Juror (uncredited) | Inquest Juror (uncredited) |
 Ray WalkerRingmaster (archive footage / uncredited) | Ringmaster (archive footage / uncredited) |
