The seminal graphic novel written by Alan Moore (Watchmen) that ushered in a new, darker spin on The Dark Knight is adapted for the screen in this animated feature. The Joker (voiced by Mark Hamill) launches his most diabolical assault ever upon Commissioner Gordon (Ray Wise) and his family, including his daughter Barbara Gordon (Tara Strong). It's up to Batman (Kevin Conroy) to stop this madman in his tracks - but in doing so, he'll realize how he and his arch nemesis are very much the same. Extras include featurettes, bonus cartoons, sneak peeks and more.