Taking the Star Trek lead-in “Space, the final frontier” somewhat literally, 2005’s Serenity fuses sci-fi and Western genres with action-packed results. Written and directed by Joss Whedon (of Buffy the Vampire Slayer and Angel fame), Serenity serves as a continuation of his short-lived Fox series Firefly — a show reportedly pitched as “Stagecoach in space.” Set in the year 2517 on a spaceship captained by the petty criminal Malcolm “Mal” Reynolds (a war veteran bent on intergalactic misbehaving), Serenity picks up steam when a young psychic named River takes refuge onboard. Reprogrammed by scientists as part of a dangerous experiment, River turns into a murderous martial artist any time she hears the subliminal messages being broadcast by her government masters. Co-presented by the Pearl and Alamo Drafthouse, the film closes out the “Westerns” chapter of the interactive Friday Night Films in the Park series. Free; 8pm Fri, Jul 27; Pearl Brewery, 200 E Grayson, (210) 212-7260, atpearl.com; Check out our full online calendar of upcoming events here: calendar.sacurrent.com.