Why is Serenity rated PG-13?
Official MPAA Rating: Serenity is rated PG-13 for for sequences of intense violence and action, and some sexual references.
This is a very violent film for PG-13 and would likely be rated R if it were not for the relatively low levels of sex (one very short scene implies an unmarried couple is about to make love) and language (about a half dozen mild profanities are heard). Decomposing bodies are portrayed, blood is plentiful, and rape and torture are discussed. With a few “jump scenes” and the cast in nearly continual peril, parents are advised to screen the film before considering it for family members.