RKO Radio Pictures, Inc. ; producers, Merian C. Cooper, Ernest B. Schoedsack ; story, Merian C. Cooper and Edgar Wallace ; screen play by James Creelman and Ruth Rose ; directed by Merian C. Cooper, Ernest B. Schoedsack
a production Federiz ; [Cineriz] ; a film by Gualtiero Jacopetti and Franco Prosperi ; produced by Mario Maffei & Giorgio Cecchini ; commentary written by Gualtiero Jacopetti