Last year at Comic-Con fans were delighted to hear that iconic Batman graphic novel The Killing Joke will finally be getting an animated version.

Yesterday we got the first teaser trailer for the film, along with a 10-minute behind-the-scenes video. The voice actors for the film, are the same voice actors from Batman: The Animated Series, with Mark Hamill aka Luke Skywalker (who voices the Joker), commenting: “If people want to see a really nasty, vile Joker, this is the one.” The behind the scenes clip also reveals that they will go more in-depth on the Batgirl/ Barbra Gordon story. Fans will get to see Gordon as Batgirl and not just the victim, which adds another layer to the already dark story-line. “The audience gets to spend more time with Barbara Gordon as a person before the events of The Killing Joke,” says the film’s executive producer Bruce Timm.