(13 parts) "The Ghost Brigade" (May 1948) (11 parts) "The Mystery of the Sleeping Beauty" (May–June 1948) (18 parts) "The Secret of Meteor Island" (June–July 1948) (17 parts) "The Voice of Doom" (July 1948) (18 parts) "The Secret of the Genie" (August 1948) (10 parts) "The Mystery of the Letter" (August 1948) (11 parts) The remaining serialized stories are all either wholly or partially missing. For those stories where some episodes are available in circulation, it will be noted which parts are available. "The Mystery of the Silver Buffalo" (August–September 1948) (11 parts, Parts 1–3, 8, 9 available) "The Secret of Stone Ridge" (September–October 1948) (17 parts) "The Mystery of the Unknown" (October–November 1948) (17 parts) "Murder Scores a Touchdown" (November 1948) (10 parts) "The Riddle of the Mystery Message" (November–December 1948) (13 parts) "The Vanishing Killers" (December 1948) (11 parts) "Superman's Secret" (December 1948) (8 parts, Part 5 available) "The Return of the Octopus" (December 1948 – January 1949) (16 parts) "The Mystery of the Spellbound Ships" (January–February 1949) (11 parts) Beginning February 7, 1949, The Adventures of Superman episodes expanded to 30 minutes each. All were transcribed. Each episode was self-contained and had an individual story title. Only "The Mystery of the $10,000 Ghost", "The Mystery of the Flying Monster", and "The Case of the Double Trouble" are available in circulation. "The Frozen Death" (February 7, 1949) "The Mystery of the Golden Eagle" (February 9, 1949) "The Riddle of the Chinese Jade" (February 11, 1949) "The Curse of the Devil's Creek" (February 14, 1949) "The Lost Civilization" (February 16, 1949) "The Mystery of the Voice Machine" (February 18, 1949) "The Mystery if the Little Men" (February 21, 1949) "The Story of Marina Baum" (February 23, 1949) "Death Rides the Roller Coaster" (February 25, 1949) "The Mystery of the Singing Wheels" (February 28, 1949) "The Case of the Poisoned Town" (March 2, 1949) "Mystery of the $10,000 Ghost" (March 4, 1949) "Mystery of the Flying Monster" (March 7, 1949) "Case of Double Trouble" (March 9, 1949) "Superman's Mortal Enemy" (March 11, 1949) "The Mystery of the Disappearing Diamonds" (March 14, 1949) "The Cat as Big as an Elephant" (March 16, 1949) "The Mystery of the Walking Doll" (March 18, 1949) "The Return of Terror" (March 21, 1949) "How Time Stood Still" (March 23, 1949) "The World's Greatest Secret" (March 25, 1949) "Crime by the Carload" (March 28, 1949) "Fangs