The Grayson Submarine, Part One (Superman EP0187)

Clark Kent heads out to sea with the U.S. Navy to rescue a submarine that is mysteriously immobile.

Original Air Date: May 12, 1941

This great Serial radio show from the 1940s is brought to you by Laser and Sword MagazineLaser and Sword Online store and download Issue 1 for free or purchase the Annual Edition containing 11 action packed stories