April 20, 2009: A new trailer for Batman Arkham Asylum was released, revealing the unique appearance of Gotham City's resident jester, Harley Quinn.

The character of Harley Quinn first appeared in the Batman: The Animated Series, where she was intended to be just a temporary walk-on character. She soon began appearing in different animated episodes and proved so popular that she was added to the Batman comic book.

Harley Quinn has an odd, mostly one-sided, romantic relationship with The Joker. They have known each other since she was a young psychology student in college, and he later secretly paid off her tuition. At one time, they even almost got married. But The Joker is usually very abusive towards Harley Quinn and often treats her with complete disdain. At the slightest sign of affection from her love interest, however, Harley Quinn is immediately back at his side. In more recent comics, Harley declares that she and The Joker have broken up, after she discovered that he was planning her death.DCAU Wiki: Harley Quinn Wikipedia: Harley Quinn

Batman: Arkham Asylum takes place entirely within the confines of Arkham Asylum, a psychiatric institute for the criminally insane located on the outskirts of Gotham City. The Joker has taken over the asylum and and it's up to Batman to clear him out. A number of other heroes and villains also make an appearance in the game, including The Riddler, Penguin and Commissioner Gordon. The story, penned by Paul Dini, is based loosely on that of the Batman comics.Kotaku: Eidos announce ANOTHER Batman Game (August 12, 2008) 1up.com: Eidos Announces Batman: Arkham Asylum (August 13, 2008)

• DCAU Wiki: Harley Quinn

• Wikipedia: Harley Quinn

• GameFAQs: Batman: Arkham Asylum "Harley Quinn" Topics (Xbox 360) | PS3