Despite her background as a psychologist, Harley Quinn doesn't seem to be dealing with loss very well. The teaser for the upcoming "Harley Quinn's Revenge" add-on for Batman: Arkham City sees the murderous moll grow even darker, even managing to gun down the Dark Knight.

It's already been leaked that you'll spend part of the time playing as Robin in the story-based downloadable content, and apparently you'll be trying to rescue Batman from Harley's clutches. Harley Quinn's Revenge drops onto Xbox 360 and PS3—via download or on-disc as part of the Batman: Arkham City Game of the Year Edition—and in two weeks.