<P> During the psychotic break that follows exposure to the Lazarus Pit, the Riddler deduces Batman's secret identity and that the late Jason Todd was once Robin; he then reveals his knowledge to Hush . He has Clayface shapeshift into the form of Todd in order to torment Batman haunted by the former Robin's death . Batman first thinks that Riddler had stolen Todd's corpse and hid it outside of Gotham Cemetery, but it was revealed later in a later storyline, Batman: Under the Hood, that Todd was alive the whole time and had personally played a role in Riddler and Hush's scheme . </P> <P> When the Riddler threatens to expose Batman's secret identity, the Caped Crusader mockingly labels it an empty threat, pointing out that if Riddler revealed the answer to the riddle "who is Batman?", it would become worthless, something Riddler would not be able to stand . In addition, Batman warns him that if he reveals the secret, it would give Ra's al Ghul a vital clue that he used a Lazarus Pit without his permission, and the League of Assassins would subsequently retaliate against him . </P> <P> The fallout from the Riddler's failed scheme is played out in Batman: Gotham Knights #50 - 53 . In the story "Pushback", Hush reappears and beats Riddler senseless across a rooftop . Seeking refuge, Riddler goes to the Joker and the Penguin . He offers to tell the Joker who had killed his pregnant wife Jeannie if the Clown Prince of Crime would protect him from Hush . Joker immediately agrees, but eventually Hush, with the help of the impostor Prometheus, defeats him, forcing Riddler to flee for his life . </P> <P> In Detective Comics #797 - 799, the Riddler seeks shelter from Poison Ivy only to be humiliated . Riddler and Poison Ivy then face off in a physical duel, which Ivy wins easily . </P>

Is the riddler and the joker the same character