Poison Ivy is back to wreak havoc on the people of Gotham's allergies... only it's much worse than that. Luckily for the innocents, Swamp Thing has returned to help thwart Poison Ivy's plans. Villains can learn more about Poison Ivy’s plans by speaking to her in the Hall of Doom’s Pit, while Heroes can speak to Swamp thing in the Watchtower’s Aquacultural Area to help bring down Ivy and her minions.