However, in his first appearance, the character wasn't ... The character's final appearance in the DCAU comes in the Batman Beyond episode titled "Meltdown". This series is set in the future ...

Harley Quinn out-fought the Dark Knight in her very first appearance. Harley Quinn first appears in DC's canon in Batman: Harley Quinn #1 by Paul Dini, Yvel Guichet, Aaron Sowd, Richard Horie ...