Ivy throws numerous seeds on the ground in front of her (depending on the location) and grows thorned vines in a medium-sized area. Bed of Thorns: A ground-targeted move with 3 possible locations: close, mid or far from her.Ivy's agility and strength have improved, allowing her to fight bare-handed with little difficulty. Ivy uses her plants to assist in her attacks with methods such as poison, tendrils, and even creatures made from her plants. She, along with the other members of the Society, disband once she realizes that Brainiac will destroy the Earth rather than let them conquer it. She is not seen again for the rest of the game. Suddenly, Harley Quinn begins to go into shock, forcing either Catwoman or Cyborg to try to take care of her, while the other fights Poison Ivy, with either Cyborg or Catwoman emerging victorious. Poison Ivy then expresses disgust towards Catwoman, who was spared from the harsh treatment at Arkham Asylum (thanks to Batman) that the other inmates had to undergo. Either way, Harley Quinn is eventually defeated. She later ambushes Cyborg, Catwoman, and Harley Quinn at Arkham Asylum and infects Harley with her iconic pink pheromones, causing her to attack either Cyborg or Catwoman (depending on the player's choice), while the other will battle Poison Ivy. Harley tries one last time to convince her to turn on the Society and join them she coldly refuses the request, and the two fight, with Harley emerging as the victor. While she was explaining her motives, however, Harley had been cutting the vines holding her, and after Ivy finishes her statement, she successfully escapes, followed by Canary and Arrow. She then explains that Batman had promised to preserve the Green, but all Batman had done was build more cities over the Green, making Batman no different than Superman in her eyes.
Harley is at first relieved to see her, hoping that she will help them, but Ivy later admits that she is part of the Society, much to Harley's disappointment and sadness. Poison Ivy ambushes and captures Black Canary, Green Arrow, and Harley Quinn when they try to intercept the shipment of fear gas in Slaughter Swamp. She joins the Society to further their common interest in bringing mankind to its knees, but at heart, Ivy’s desire is to ensure that in any new world order, flora dominates fauna. Pamela Isley was once an innovative but radical botanical biochemist with a singular goal: to make the world safe for plant life to flourish.