Ralph Bundy explains the situation to Batman. As Joker has become the new ambassador for Iran to the U.N., he now has diplomatic immunity and no one is allowed to touch him, and to make sure that Batman doesn't create an international event, the U.S. Government has called in Superman to make sure that Batman is under control. Batman doesn't like the situation and leaves the place, hoping that his actions don't put him against Superman.

At his hotel, Burce thinks about the situation and contemplates the few options he has left. Batman thinks about letting the Joker be free for once, but then he remembers that he killed Jason, and decides to investigate what is Joker's real plan.

At his hotel room, Joker prepares himself for his speech the next day and he mentions something about large dead crowds. Batman surprises Joker from behind and tells him to give up his plan and return to Arkham Asylum. Joker tells him that he won't and starts teasing Batman, confessing that he killed Robin and he enjoyed it; which confirms all of Batman's suspicions. Before leaving, Batman thanks Joker for comfirming the information on Robin's death and for making his decision much easier. As Batman leaves, Joker pulls a gun and tries to shoot Batman, but he was already gone and Joker is left alone, excited about his plan for the next day.

As it is planned, people start to arrive at the United Nations Building and among the crowd is Bruce Wayne. Joker makes his way in the room and for a moment, he stops and stares at Bruce, long enough for Wayne to wonder if the clown has recognized him beyond the mask. However, seconds later, Joker continues to the dais, laughing all his way up. Jokers starts speaking in the name of Iran and after a vehement speech, he reveals his true motives and sprays the room with his laughing gas and Bruce quickly changes into Batman, before one of the guards destroys Joker's gun and stops the gas from spreading. However, Joker tells the guard that the gas is already in the air and it's too late to stop it. The guard then starts inhaling all the gas from the room and it is revealed that the guard is in fact Superman in disguise. The Man of Steel tells Batman to finish Joker while he finds an empty space to release all that toxic gas. Joker detonates a bomb to open a hole in a wall and tries to escape but Batman follows him outside, where a helicopter is ready to take Joker away, but Batman manages to jump and reaches the chopper before it lifts completely. Baman clims inside the cabin of the helicopter and tries to grab the Joker, but his henchmen start shooting at them before realizing that one of the bullets killed the pilot. Joker and Batman are wounded as well and before the helicopter crashes into the river, Batman jumps and dives in the water and moments later, Superman gets him out of the water and Batman tells him to find the Joker's body. However, nobody is able to find Joker's body and Batman realizes that things between him and Joker always end unresolved.

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