Harley Quinn makes her very first appearance in a comic book after her iconic TV debut, and the world would never be the same! Barbara Gordon is attending a costume party and decides to go dressed as none other than her hero and secret identity – Batgirl!

Now in trade paperback, this fantastic collection features the origin of Harley Quinn, co-starring The Joker and Poison Ivy. Also included are tales starring The Scarecrow, Ra's al Ghul, Mr. Freeze and Batgirl from BATMAN ADVENTURES ANNUAL #1-2, BATMAN ADVENTURES HOLIDAY SPECIAL, ADVENTURES IN THE DC UNIVERSE #3 and BATMAN BLACK AND WHITE #1.

Some of the best all-ages Batman stories ever are back in this new title collecting BATMAN ADVENTURES #2 and 27, BATMAN: GOTHAM ADVENTURES #2 and 4, and a short tale from ADVENTURES IN THE DC UNIVERSE #3. Guest-starring Catwoman, The Joker, Two-Face and more!