Harley Quinn is a fictional DC comics villain who appeared as Joker's love interest.
When Joker became the king of Gotham, he had no need of Harley and abandoned her. Angered, she and many former Joker thugs joined the Aquaman's resistance group with Flash and Catwoman. She discovers the portal and enters it.
Harley Quinn is one of the thousands of characters to appear in this 2D action battle royale.