Superman (Rebirth) #19 Gary Frank & Brad Anderson Variant Cover

"SUPERMAN REBORN” part three! In the penultimate chapter of this tale the life of Superman’s son hangs in the balance—and the Man of Steel faces the truth about his life!

It turns out the imposter Clark Kent is in fact Mister Mxyzptlk! He's mad at Superman due to him not rescuing him from Oz's cells. Superman says that he didn't know, but alas, it's too late now and as a punishment he makes Lois & Clark forget that they have a son. This all happens while Clark was playing Mxy's "game", which was to find Jon in time. Jon yells that he is his son and then Clark suddenly remembers and finds his son.