After accidentally undoing the Justice League's origin stories and kinda-sorta dooming our timeline, Harley's done all she can to right her wrongs and bring the DCU's heroes back, and she's had a lot of fun doing it. But now she has found herself face-to-face with the most tragic origin in the DCU--Batman's. Will she be able to doom Bruce Wayne's parents to their untimely fate for the sake of the universe?