Ostensible conclusion to the endlessly blood-soaked franchise that reaches back to John Carpenter’s 1978 film finds its original heroine (Jamie Lee Curtis) worried that her granddaughter’s (Andi Matichak) troubled new boyfriend (Rohan Campbell) may be giving way to the evil tendencies embodied, in their deadliest form, by the relentless, seemingly indestructible murderer (James Jude Courtney) who’s been preying on her since the days of disco. Wrapping up a trilogy of installments that began with his 2018 reboot, director and co-writer David Gordon Green awakens some initial interest through a character study of the ethically confused lad and the inclusion of some humorous moments. But there turn out to be more unintentionally funny interludes than deliberate jokes while the last third of the proceedings is given over to the spectacle of a mindless, hideous rampage. Look for: A tentative exploration of morality. Look out for: Revolting gory violence, including mutilation, many grisly visuals, offscreen nonmarital sexual activity, about a half-dozen uses each of profanity and milder oaths, pervasive rough language, much crude talk. The Catholic Moviegoer’s guidance is U – unsuitable for all. The Motion Picture Association rating is R – restricted; under 17 requires accompanying parent or adult guardian.