This character design is based on Harley's alter-ego Harleen Quinzel from "Mad Love," the single-issue graphic novel written by Paul Dini, writer and director of Batman: The Animated Series and Batman Beyond, and Bruce Timm, executive producer on The New Batman/Superman Adventures and the co-creator of Batman: The Animated Series. It was set in the continuity of The Batman Animated Series. It won an Eisner Award for "Best Single Story" in 1994. It was later adapted (with minor alterations for pacing) as an animated episode of The New Batman Adventures.