She crash landed in Robinson Park in the center of Gotham and was found by Poison Ivy. When Harley regained consciousness, Ivy initially planned to kill her. The prospect of her own death totally fails to move Harley, and Ivy is curious as to why. She convinces Harley to tell her story, and soon feels a kinship to her. Considering her another castoff, Ivy offers to help Harley take her revenge on both Batman and the Joker. Ivy took her back to her lair in a toxic waste dump and nursed her back to health. This included injecting Harley with a serum that Ivy had developed which has given Harley immunity to various assorted toxins and Ivy's own poisonous touch and also dramatically enhances Harley's strength and speed. Ivy intends to give her new friend an edge on Batman and the Joker. Quinn and Ivy teamed up and conducted a number of successful capers. Hot-blooded Harley, however, is angrier at the Joker than at Batman, and even initially works with the Dark Knight to help bring down the Clown Prince of Crime.