The Mysterious Traveler was a popular old time radio show ranging from fantasy to science fiction to mystery and suspense. It ran from 1943 to 1952. One of the most popular episodes to air was Behind The Locked Door, which was repeated often due its extreme popularity. The Mysterious Traveler radio show was also made into a magazine and a comic series. The cast members were Jason Beck, Lon Clark, Roger DeKoven, Elspeth Eric, Wendell Holmes, Bill Johnstone, Joseph Julian, Jan Miner, Santos Ortega, Bryna Raeburn, Frank Readick, Luis Van Rooten, Ann Shephard, Lawson Zerbe and Bill Zuckart. The sound effects were provided by Jack Amrhein, Jim Goode, Ron Harper, Walt McDonough, and Al Schaffer. It’s a shame that only 75 of the 370 episodes still remain. The Mysterious Traveler inspired other old time radio shows, such as The Sealed Book. The show had no sponsors.