Main Cast and Crew
Cast in Credits Order
Juliet Mills ... Jessica Barrett
Gabriele Lavia ... Robert Barrett
Richard Johnson ... Dimitri
Nino Segurini ... Dr. George Staton
Elizabeth Turner ... Barbara Staton (as Elisabeth Turner)
Barbara Fiorini ... Gail Barrett
Carla Mancini ... (credit only)
David Colin Jr. ... Ken Barrett
Vittorio Fanfoni ... Mr. Francis
Gino Marturano ... (as Luigi Marturano)
Rest of cast listed alphabetically:
Joan Acti ... (uncredited)
Robert Booth ... Voice of Demon / Narrator (uncredited)
George Montage ... Dr. George Staton (uncredited)
Edmund Purdom ... Devil (uncredited)
Elizabeth Wieseman ... Girl at party (uncredited)
Directed by
Ovidio G. Assonitis ... (as O. Hellman)
Roberto D'Ettorre Piazzoli
Writing credits
Ovidio G. Assonitis ... (story & screenplay)
Antonio Troiso ... (story & screenplay)
Roberto D'Ettorre Piazzoli ... (screenplay)
Giorgio Marini ... (collaborating writer)
Aldo Crudo ... (collaborating writer)
Alex Rebar ... (collaborating writer)
Christopher Cruise ... (collaborating writer)
Sonia Molteni ... (uncredited)
Produced by
Ovidio G. Assonitis ... producer
Enzo Doria ... producer
Edward L. Montoro ... producer