Action Comics, Vol. 1

The Fiend in the Fortress of Solitude - Three criminals learn the location of the Fortress of Solitude. They kidnap Clark Kent to use as a hostage in case Superman shows up while they are inside.The Challenge of the Expanding World - The Flash and the Atom start to get the world to return to its original size, but there may be terrible consequences if that isn't handled properly.The Planet of Prey - Superman encounters a planet that's trying to eat him.