After springing her psychotic killer boyfriend, the Joker, from Arkham Asylum, former psychiatrist Harleen Quinzel put on a clown costume and said sayonara to sanity. Now Harley brings her own unique brand of psychosis and revelry to whatever she does, whether it's causing mayhem alongside her beloved Mistah J., saving the world as the nuttiest member of the Suicide Squad, or relaxing with her gal pals Poison Ivy and Catwoman. With her deranged mix of fear and fun, she knows how to leave a crowd in stiches.