Superman #188

Superman stands unflinching at the center of a wild brawl as multiple attackers hurl themselves at him — beams, chains, and blows all deflecting harmlessly off the Man of Steel — while a commanding instructor at the back of the room threatens his students with expulsion if they can't crack the problem of destroying the Last Son of Krypton. This 1966 DC issue, with cover art by Curt Swan and George Klein, sets up a deliciously outlandish premise: a literal academy dedicated to training Superman's would-be destroyers. Writer Otto Binder and artist Al Plastino bring the sensational novel "The School for Superman Assassins!" to life inside, and the cover promises exactly the kind of inventive Silver Age storytelling that made this era so much fun.