The fifth installment of the "Rambo" movie franchise has yet to receive an official release date, but a new rumor is once again circulating about the Sylvester Stallone starrer. Slash Film reports that "Rambo 5" might be titled "Rambo: Last Blood."

The report originally came from a ComingSoon.net reader named nopr100. According to Slash Film, ComingSoon.net usually "doesn't report on rumors of this kind unless they know something more." So there might be something official to the rumored title.

Splendid Films confirmed that Stallone, who directed and wrote the past "Rambo" films, has already started writing the fifth movie's screenplay. According to the report, "With Rambo V, Sylvester Stallone returns in his iconic role. This time he goes up against a Mexican cartel. Stallone describes the new Rambo as his version of No Country for Old Men," Slash Film stated.

Air Herald added that John Rambo might face his toughest challenge in the movie.

Stallone last portrayed the character in 2008. He directed and wrote the film, which, according to Slash Film, earned almost $115 million worldwide when it was released in theaters.

Air Herald reports that Stallone "acquired the film rights to the novel 'Hunter' by James Byron Huggins," which the fifth movie might be based on.

The novel's plot revolves around expert hunter Nathaniel Hunter, who was sent by the American government to the Arctic Circle to track and kill a mythical beast. "As the story progresses Hunter learns that the beast is actually half human and was the result of a government science experiment," Air Herald noted.

According to the news outlet, it was initially thought that Stallone would replace the Nathaniel Hunter character in the novel with Rambo. However, Air Herald notes that "Rambo 5" could take on a "Mexican cartel plot" instead and be "a separate project entirely."

Stallone, at first, turned down making a fifth "Rambo" film. "In a 2010 interview, Sly said that he thinks 'Rambo's pretty well done' and that he was 99% sure there wouldn't be any more. However, two years later he was quoted as saying 'I'm dying to do another Rambo'," Slash Film reports.

The actor/director will once again partner with Millennium Films and Ava Lerner to produce the movie, which according to Air Herald, is already in pre-production stage in Shreveport, Louisiana. The film is only in its first stages of development, so fans would have to wait for official announcements from the production team.