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Batman and Robin form an uneasy alliance with Harley Quinn in order to learn where the Joker has hidden a stolen atomic bomb. Harley leads them on a madcap hunt through Gotham, and eventually into a deadly show-down with the Clown Prince of Crime himself. Harley is torn between her promise to help Batman and her twisted love for the Joker, but her better nature wins out in the end.
Harley: Look, Bats. When I was a doctor I was always listening to other people's problems. Then I met Mister J who listened to me for a change and made everything fun.
Batman: You think it's funny when he hurts people?
Harley: It's just a joke.
Batman: Hope you're still laughing when it's your turn.
Harley Quinn: (The Joker is ready to leave Gotham to the fate of the bomb he planted, but Harley wants to know...) Well, what about all our friends? Two-Face, Poison Ivy, Lizard man, puppet head, and...
Harley Quinn: (After arriving at the Jokers old hideout) How do you like our ha-hacienda?
Harley Quinn: Did you see the way I handled those creeps? Pow! Bam! Batgirl, eat your heart out!
Joker: You really should loosen up, dear, have a laugh now and then.