Poison Ivy

Botanist Pamela Isley was transformed into a plant-human hybrid by a science experiment gone wrong. With chlorophyll flowing through her veins instead of blood, she developed a toxic touch and a pheromone-fueled talent for seduction, becoming Poison Ivy. Her crimes have become more ecologically focused as she has increasingly abandoned her human side, identifying more with the natural world. Her unique brand of eco-terrorism often puts her into conflict with Batman, whose iron will usually protects him from her seductive powers.

Batman: Arkham Asylum
Batman, whilst searching for the Warden in the Penitentiary of Arkham Asylum, came across Poison Ivy in her cell. Poison Ivy desperately pleaded to the Batman to save her plants as she could sense that they were in pain. Batman disregarded the plea and proceeded to tell Poison Ivy to stay in her cell. After Batman saved the Warden, Harley Quinn made her way back, past Ivy. Ivy pleaded with Harley to let her go so that she can rescue her 'babies'. Harley refuses at first because Ivy isn't on the Joker's 'party list' but gives in rather quickly. Harley lets Poison Ivy free who then makes her way to the Botanical Gardens.

After defeating Harley, Batman made his way to the Gardens in order to gain assistance from Ivy, whose plants had been used to help create the venom. Ivy refused at first in order to let the Joker "have his fun", but eventually agreed after Batman threatened that every plant would meet its demise if she didn't. Ivy informed Batman that the spores needed to create the anti-venom were only located deep in Killer Croc's lair. Before leaving, Batman instructed Ivy to return to her cell or he'd be back to which Ivy replied that she'd be waiting for him.

The Joker subsequently injected the new Titan formula into Ivy's plant system, which had a different effect to unmutated humans, instead of a "monster plant" as the Joker expected, she remained the same on the outside but gained an enhancement to her chrolokinetic abilities, inducing rapid growth and evolution amongst her plants, even among the newly mutated plants were a species that produced glowing air born toxic spores.

Ivy wields her newfound powers to take over the island .Added by Netherith, Ivy took the opportunity to take over the entire island with her newly mutated plants, vowing to kill Batman and afterward, the Joker himself, much to his delight; looking forward to the coming battle. Batman eventually returned to the Gardens with the anti-venom formula, where Ivy beckoned Batman to come to her lair. Along the way, Batman was attacked by two security guards under Ivy's control, being forced to defeat them both. Batman attempted to inject Ivy's plants with the anti-venom before being stopped by an attacking Ivy, who forced him to contend with more Arkham guards infected by her mind-controlling plant spores, including William North and Eddie Burlow. The two engaged in a long and strenuous fight resulting in Ivy's defeat. After the Joker's defeat, Ivy was taken back to her cell by the Arkham staff.