John Carradine

Character: Narrator / Host

Elke Sommer

Character: Herself

William Peter Blatty

Character: Himself

Susan Strasberg

Character: Herself

Frank De Felitta

Character: Himself

Arthur Conan Doyle

Character: Himself (archive footage)

Robert Bloch

Character: Himself (uncredited)

Elliot Geisinger

Character: Self