Writing Lewis Clay Other Credits Mysterious Island Screenplay 1951 Cody of the Pony Express Screenplay 1950 The Adventures of Sir Galahad Screenplay 1949 Bruce Gentry Screenplay 1949 Congo Bill Screenplay 1948 Superman Screenplay 1948 Tex Granger: Midnight Rider of the Plains Screenplay 1948 The Sea Hound Screenplay 1947 The Vigilante: Fighting Hero of the West Screenplay 1947 Jack Armstrong Screenplay 1947 Son of the Guardsman Screenplay 1946 The Valley of Vanishing Men Screenplay 1942 Agent-readable