BATMAN (1940) #148

The Alien Force Twins (Batman, Robin) Aliens are invading! Can Batman and Robin find their weakness? Your Pass to New Worlds! (public service message written by Jack Schiff) Lefty Looie (gag strip by Henry Boltinoff) The Boy Who Was Robin (Batman, Robin, Alfred) What happens when Bruce’s younger cousin gets one of Robin’s costumes to commit crimes? Casey the Cop (gag strip by Henry Boltinoff) The Joker’s Greatest Triumph (Batman and Robin vs The Joker, with Commissioner Gordon) « At last I’ve unmasked Batman and have discovered his secret identity! » « Great Scott! Now the Joker knows that Batman is Bruce Wayne! »