Harley Quinn: The Wonder Years (1993-2001)
1st Appearance of Harley Quinn in comics (outside of DC continuity.) Kelley Puckett story, Mike Perobeck & Rick Burchett Cover/art. "Batgirl: Day One." Barbara Gordon attends a costume party dressed as Batgirl. Unfortunately, Poison Ivy and Harley Quinn also decide to show up. Based on Batman The Animated Series.