10 Things Everyone Always Forgets About Harley Quinn
5. Gotham City Sirens
Harley and Ivy were living together in the Riddler’s townhouse when they were approached by Catwoman to join forces and live together, giving them money that she took from Hush. She is still recovering from her heart surgery ordeal and needed help. The pair agreed with one condition: Selina revealed the identity of Batman. Pam used a plant-based truth serum on Kyle but it failed to work. After a minor villain destroyed the townhouse, they are forced to move.
After a disappointing trip home to see her family, Harley returned to Gotham and rejoined Catwoman and Poison Ivy in an abandoned animal kennel. Things were going well until Quinn abandoned the other women and broke into Arkham with the intent of killing the Joker. The pair instead staged a violent takeover of Arkham that left most of the guards and staff captured or dead. They were defeated by Batman and Catwoman and reincarcerated in Arkham.
Poison Ivy broke into Harley’s cell in Arkham to kill her but changed her mind if she would aid Pamela in killing Selina Kyle. They found Catwoman and a massive fight broke out. Selina told the pair that she had been using her influence with Batman to keep them out of prison during their whole time together. To prove this, Catwoman helped them escape when Batman arrived to arrest them.