Joker hosts a mock dinner in the caves leading to the Batcave. Alongside a bound Batman, his allies are also bound at the table with their faces bandaged, and Batman is warned that escaping will agitate flints and ignite his gasoline-doused allies. Alfred, who has been gassed by the Joker, serves all but Batman with a cloche containing their severed faces. When Joker threatens to ignite the gasoline himself, Batman escapes and triggers a blaze, but uses an explosive and his knowledge of the cave system to blow open the cave roof, allowing water to rush in from above and douse the flames. Batman pursues Joker to the edge of a large drop. Batman claims that he knows Joker's true identity, but to prevent him from saying it, Joker purposefully knocks himself over the edge and falls out of sight. Batman reads Joker's book which he claimed contained the real identities of the Bat-family but it is blank. Meanwhile, the Bat-family are gassed and attack each other but manage to fight off the gas's influence. Later, in Wayne Manor, Batman tells a recovering Alfred that after finding the joker playing card in the cave, he confronted Joker about it in Arkham Asylum as Bruce Wayne. Joker failed to acknowledge him and Batman realized that he did not care who Batman was under his mask. In the present, Batman receives excuses from the Bat-family for them not coming to meet with him. Later, Batman studies the chemical makeup of the gas Joker used on the Bat-family and finds an inert isotope; the chemical compound "Ha".
Joker, however, had discovered the ruse sooner than he expected and followed him to the pool. Having already retrieved samples to create a cure to the toxin, Batman fought his arch nemesis for what seemed to be the last time, during which he and Joker sustained several grave injuries. With the cave collapsing from explosives set off, Batman stopped Joker from escaping by holding him away from the pool, which was blocked with the falling rock. With Gotham once again saved, Batman accepted that he would die and sent one last message to Julia, during which he refused her help to escape his fate. He and the Joker would seemingly die as the cave collapsed upon them.
In those days it was like, one artist and he had his name over it [the comic strip] — the policy of DC in the comic books was, if you can't write it, obtain other writers, but their names would never appear on the comic book in the finished version. So Bill never asked me for it [the byline] and I never volunteered — I guess my ego at that time. And I felt badly, really, when he [Finger] died.
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