Batman fans have all been waiting for Bruce Timm's adaptation of Alan Moore and Brian Bolland's 1988 graphic novel The Killing Joke, especially after everyone learned that it will be Mark Hamill's most terrifying portrayal — or at least voicing — of The Joker.

After fans patiently waited for signs, The Killing Joke finally released its official trailer, and it looks every bit as awesome and chilling despite straying away a little from the source material.

The graphic novel serves as the origin story of The Joker and will offer a look at how the Clown Prince of Crime became insane and very powerful.

While the source material has been criticized over the years for its terrible treatment of Barbara Gordon, also known as Batgirl, the adaptation promises to extend more respect to her character. It will also present a new prologue so that there will be an interesting change.

That, however, does not change the fact that things will get violent and sensitive. It has already been confirmed, after all, that The Killing Joke received an R-Rating.

Watch the trailer below.

Fans who are going to the San Diego Comic-Con will be the first ones to see the adaptation since it will hold its premiere there but others who are not so lucky will have to wait awhile longer because there has not been any announcement for the DVD and Blu-Ray's actual release date.

Until then, fans can just reread their copies of The Killing Joke. Just do not take it to heart too much because there may be a few changes to the canon. Even The Joker's voice actor, Mark Hamill, suggests that it is best not to compare the animated adaptation with the graphic novel.

#KillingJoke movie is an ADAPTATION of classic book by #AlanMoore #BrianBolland Should be judged on its' own merits pic.twitter.com/7L4EW6BXE7

— Mark Hamill (@HamillHimself) April 27, 2016