“Batman: The Killing Joke” graphic novel animated movie adaptation might be the superhero’s first R-rated movie. Producer James Tucker announced the possibility at New York Comic-Con on the Batman: Bad Blood panel, Tucker said that they were given permission to make The Killing Joke an R-rated animated film.

Even thoughWarner Bros has given the team behind the direct-to-disc movie permission for the higher rating, Tucker took to twitter to say that it doesn’t mean he will make The Killing Joke R-rated.

“The Killing Joke” one-shot comic book was Created by Alan Moore and Brian Bolland in 1988, the story deals with the Joker’s origin story.

The adaptation was originally announced back in July at San Diego Comic-Con, the film will include a 15-minute prologue that will help set up the story and offer fans of the comic book something fresh to the source material.

Warner Bros is also gearing up for its 2016 release of live-action film Batman v Superman: Dawn of Justice, due out on March 25, 2016. “Batman: The Killing Joke” is due for release in 2016.