Two of the biggest heroes in comic book history, Superman and Batman, will fight one another one month from now on the big screen in "Batman v Superman: Dawn Of Justice." While it's been reported that the film will have a darker tone than previous onscreen Batman stories, the movie will be rated PG-13. However, when the movie comes to Blu-Ray, there will be a special edition with an R-rating. 

According to the Classifications and Ratings Administration, the "Batman v Superman: Dawn of Justice Ultimate Edition" will be rated R for "sequences of violence." This version is expected to be the director's cut of the film, which will feature even more action and violence than the theatrical release.

"Batman v Superman: Dawn of Justice" director Zack Snyder is no stranger to making R-rated superhero movies. In 2009, Snyder directed "Watchmen," which featured "strong graphic violence, sexuality, nudity and language." There have also been other comic movies rated R over the years, including "The Punisher" in 2004 and "Kick-Ass" in 2010.

While it's been done before, R-rated comic movies seem to be a craze in Hollywood right now thanks to the success of "Deadpool." "Deadpool" has made over $500 million worldwide and broke several box office records, including biggest R-rated opening weekend, biggest "X-Men" debut and biggest 20th Century Fox debut, according to Forbes.

Following the success of "Deadpool," it's already been reported that the studio is now looking to make the third "Wolverine" movie an R-rated movie as well, reports. The film will be Hugh Jackman's last as the popular "X-Men" character and is expected to hit theaters on March 3, 2017. There are also rumors that the next DC comics movie, "Suicide Squad," may also get an R-rating when it comes out Aug. 5.

"Batman v Superman: Dawn of Justice" soars into theaters on March 25.