O Jacaré Humano
Voltar
Beverly GarlandJoyce Webster, aka Jane Marvin
Bruce BennettDr. Eric Lorimer
Lon Chaney Jr.Manon
George MacreadyDr. Mark Sinclair
Frieda InescortMrs. Lavinia Hawthorne
Richard CranePaul Webster
Douglas KennedyDr. Wayne McGregor
Bill BradleyPatient 'Number Six' (sem créditos)
Hal K. DawsonConductor
Dudley DickersonPorter
John Frederick1st Male Nurse (sem créditos)
Ruby GoodwinLouann- Ken KaneThird Male Nurse (sem créditos)
Boyd StockmanAlligator-headed Paul- Vince Townsend Jr.Toby
- Lee Warren2nd Male Nurse (sem créditos)