The crossword solution for the term 'Batman Foe Poison ___' is IVY (3 letters). Poison IVY is a fictional supervillain appearing in comic books published by DC Comics, commonly as an adversary of the superhero Batman. She is a botanist who gained an immunity to poisons and toxins and the ability to control plants. Her real name is Pamela Isley, and she is a frequent accomplice of the Joker and Harley Quinn.