Pamela Isley is an eco-terrorist with plant-based powers who goes by the name Poison Ivy and often clashes with Batman.
She was among the inmates at Arkham Asylum who was mutated by Shredder and Ra's al Ghul, using mutagen obtained from another dimension. She was transformed into a massive praying mantis, but retained her ability to control plants, which she used against Batman. Michelangelo immobilized her in ice from Mr. Freeze's ice ray.
It was later confirmed that she would revert back to normal in a week's time.