Bela Lugosi (Dr. Alex Zorka)
Robert Kent (Capt. Bob West)
Dorothy Arnold (Jean Drew)
Regis Toomey (Jim Daley)
Edward Van Sloan (Chief Jarvis)
Saul A. Goodkind
Edward Norris
Frank Mayo
Anthony Averill (Rankin)
Roy Barcroft (Parker)
Jack C. Smith (Monk)
Eddie Acuff (Mac)
Forrest Taylor (Black)