The Joker and Carnage meet when behavioral psychiatrist Cassandra Briar attempts to use the two killers as tests for a chip that will 'lobotomize' their homicidal instincts. The Carnage symbiote neutralizes Kasady's chip after it is implanted, with Kasady pretending that the chip had worked so that he could meet the Joker. After Carnage removes the Joker's chip, the two's mutual psychoses lead them into a brief alliance before their differing methods of murder cause a clash. The Joker tries to kill Carnage with a bomb, but Carnage drapes a piece of the symbiote over a corpse to fake his death. Batman and Spider-Man uncover the trick, and Batman is subsequently engulfed in Carnage's symbiote tendrils. Carnage proposes to kill Batman, but the Joker threatens to set off a bomb to destroy Gotham, himself and Carnage, rather than see Carnage kill Batman. As Batman battles Carnage, Spider-Man follows the Joker. The Joker defiantly dares Spider-Man to kill him, however, and Spider-Man is unable to stoop to his level, electing instead to apprehend the Joker in classic superhero style.

"Disordered Minds"