A masked criminal and a member of the Pact, her true identity was Dr. Harleen Quinzel, a former psychiatrist at Arkham Asylum and Blackgate Penitentiary. Whilst working with the group to retrieve a biological weapon, she became the one-sided crush of former patient "John Doe" and an associate of Bruce Wayne. Harley would later betray the Pact and become one of the factors of John's transformation into something darker. POV YOUR UNDERCOVER BRUCE