Fans of Alan Moore and Brian Bolland’s definitive one-shot graphic novel, Batman: The Killing Joke, have been waiting a long time for a full-length adaptation. There was, therefore, a lot of excitement when an animated film was announced, followed not long after by the news that both Kevin Conroy and Mark Hamill would reprise their roles as Batman and the Joker, respectively. DC also announced that the animated feature would, in all likelihood, warrant an R-rating, allowing it to remain true to its source material. Recently, Hamill took to Twitter with the first panel of the upcoming film – a still of a Batman: The Animated Series-esque Batman clutching the Joker. Now, DC is giving fans their first look at the hotly anticipated animated event. In a featurette released today, DC outlined the history of one of the most controversial Joker origin stories (watch it above, or in another fan edit, minus the purple explosions). The video features several major players from the production, including executive producer Bruce Timm, director Sam Liu, and DC’s creative director of animation Mike Carlin. The teaser includes a brief backstory on the history of The Killing Joke and offers a little insight for the unenlightened about Batman and the Joker, and the fragmented mirror shards which separate them. It also gives fans a taste of Conroy, Hamill, Tara Strong (as Batgirl) and Ray Wise (as Commissioner Gordon) in their roles.