Boris KarloffDavid Mallory Alan BaxterJohn Baron aka The Kid Hobart CavanaughPetty Louie Samuel S. HindsSteven Ranger David OliverMike Callahan Frank ReicherCarl - gang engineer Edwin MaxwellLawyer Kruger George ClevelandSam Adams - Company Engineer (uncredited) Ruth FallowsWaitress (uncredited) George HumbertMr. Spinelli (uncredited) Nina CampanaMrs. Spinelli (uncredited) Charles Cahill WilsonPolice Capt. Wallace (uncredited) Chuck HamiltonPoliceman (uncredited) Tristram TupperScreenplay Robert Presnell Sr.Producer Jack OttersonArt Direction Loren PatrickArt Direction George RobinsonDirector Of Photography Gilbert KurlandSound Supervisor John P. FultonVisual Effects 
