Superman. February 12, 1940. This broadcast is considered the first show of the series heard on the Mutual net. If this and the following shows are from Mutual, the commercials have been deleted (the first sponsor was Hecker's H-O Oats).   Superman helps the U. S. Navy battle, "The Shark." Clark Kent is working for "Paris White" of "The Daily Flash!" Clark is ordered to Newport News, Virginia to find, "The Shark." Superman listens to "The Shark" from outside his submarine (a "Y-Boat"). oldtimeradiodvd.com