This story is interesting in that it explores the possibility that, as an alien, Superman might well be subject to life changes that Earth folks don't go through. Makes sense!
Superman emerges from his cocoon as a more alien looking figure with amnesia.
Meanwhile, the real Man of Steel, held captive by kryptonite (sure was a LOT of it around in those days), hears the bad guys' plan to get into the Batcave.
But Ol' Supes outsmarts everyone including, for a change, Batman!
For no apparent reason, this two page reprint from a 1951 issue of JIMMY WAKELY with some nice Kubert art.