Following his escape from a mental institution, the Joker seeks revenge on those who wronged him in Batman #251, hatching an elaborate scheme to kill them all. Neal Adams' iconic cover art reflects the plot as the classic larger-than-life Clown Prince of Crime looms over Gotham City, holding an ace of spades playing card with Batman taped to it - just like in the story, The Joker is, quite literally, playing Batman.
