Well the story is titled, "The Joker Returns", and it basically opens up with The Joker escaping from prison via a powerful explosive. Later, he begins announcing death to those unfortunate souls just as he did in the first story. Eventually, there is a fight between The Joker and Batman, with The Joker pulling out a knife, but during the struggle, The Joker accidently stabs himself, and much to The Joker's dismay, he begins laughing hysterically as we the reader believe he is dying. Batman & Robin predictably make their escape from the authorities, and in one of the last panels, we find out that The Joker is not dead. That he is going to make it (a last minute decision from what I understand). And the rest is history. Also, that panel also shows the reader that The Joker's entire body is chalk white as well. And not just makeup.