The first half of the upcoming two-part animated movie adaptation of Batman: The Long Halloween is rated PG-13 for "Violence, bloody images, language and some smoking." However, the second half of the tale has received an even more mature rating.

As revealed by FilmRatings.com, Batman: The Long Halloween, Part Two, which will release this fall, has been rated R for "some violence and bloody images."

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Produced by writer Jeph Loeb and artist Tim Sale, the original The Long Halloween was a 13-issue limited series that took place after the events of Batman: Year One. Running between 1996 and 1997, it saw Batman try to learn the identity of Holiday, a serial killer who commits murders on holidays. It also created Two-Face's definitive post-Crisis on Infinite Earths origin story. Part One recently unveiled its voice cast, with former Red Hood voice actor Jensen Ackles taking on the role of the Dark Knight.

Batman: The Long Halloween, Part One stars Jensen Ackles as Bruce Wayne/Batman, Naya Rivera as Catwoman/Selina Kyle, Josh Duhamel as Harvey Dent, Billy Burke as James Gordon, Titus Welliver as Carmine Falcone, David Dastmalchian as Calendar Man, Troy Baker as Joker, Amy Landecker as Barbara Gordon, Julie Nathanson as Gilda Dent, Jack Quaid as Alberto, Fred Tatasciore as Solomon Grundy and Alastair Duncan as Alfred, along with Frances Callier, Greg Chun, Gary Leroi Gray and Jim Pirri. The film is expected to arrive this spring or summer. Part Two will arrive in the fall.

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Source: FilmRatings.com, via Collider