We first heard at the end of 2017 that Quentin Tarantino was interested in making a Star Trek movie. It seemed kind of insane at the time — it still does — but what was reported to be a “great idea” soon went to the script stage, with The Revenant screenwriter Mark L. Smith penning the story for Tarantino while the famed filmmaker finished up his latest opus, Once Upon a Time in Hollywood.
One of the reported tenets of Tarantino making this Star Trek film, which he could wind up directing or just producing if it pans out, was that it would be rated R. Star Trek movies, family-friendly sci-fi adventures that they are, have always been rated PG or PG-13 (although Star Trek: The Motion Picture originally was granted a G rating).
Source: IGN.com Quentin Tarantino Might Make a F#@%ing R-Rated Star Trek Movie