DVD previews: 'Sex Tape,' 'Snowpiercer'

Here's a look at DVDs coming out Tuesday, Oct. 21:

"Sex Tape" (R, 90 minutes, Sony): Game comedians Jason Segel and Cameron Diaz play Jay and Annie, whose boudoir routine has become, well, routine. To spice up their love life, they make an intimate home movie that accidentally goes public. Rob Lowe steals the movie as Hank Rosenbaum, the chief executive of a family-oriented toy company that's considering hiring Annie as a blogger and social-media marketer. Contains sex, nudity, language and drug use. Extras include featurettes. Also, on Blu-ray: bloopers, deleted and extended scenes, Line-O-Rama alternate takes on the jokes and "Romance Reboot With Dr. Jenn Berman" featurette.

"Snowpiercer" (R, 126 minutes, Radius-TWC/Anchor Bay): Futuristic action thriller directed by Bong Joon-ho is a smart, stylish alternative to its blunt-force cousins. Adapted from a French graphic novel about global warming, a new Ice Age and an arklike train that carries survivors on an endless loop, "Snowpiercer" also is an Orwellian allegory about wealth disparity and political inequality that, in post-Occupy times, occasionally lights up with torch-and-pitchfork verve. An uprising, led by one man (Chris Evans), moves car-by-car up toward the front of the train, where the oppressive rich and powerful ride, and where the train's creator and absolute authority (Ed Harris) resides in splendor. Contains violence, language and drug use. Extras: Critics' commentary, interviews, character studies, a behind-the-scenes look, concept art galleries and featurettes.

"Life After Beth" (R, 88 minutes, Lionsgate): With its accomplished cast and darkish, off-kilter worldview, this unconventional rom-com has a sly, skeptical streak. But the promise of its premise is squandered all too soon in what becomes yet another tiresome exercise in the way-overworked zombie genre. Dane DeHaan plays Zach, grief-stricken over the sudden death of his girlfriend, Beth (Aubrey Plaza). When Beth resurfaces, the question is whether she's resurrected or has turned into a zombie. Contains language, violence, sexual content, nudity and drug use. Extras include commentary, deleted scenes and a "Post Mortem" featurette.

Also: "The Purge: Anarchy," "A Letter to Momo" (Japan), "Le Chef" (France), "The Last Sentence" (Sweden), "For a Woman" (France), "A Coffee in Berlin" (Germany), "Mobilize," "Dorothea Lange: Grab a Hunk of Lightning," "La Dolce Vita" (1960), "The Fluffy Movie," "Crazysexycool: The TLC Story," "Misfire," "Hugh Hefner" (1973), "Kundo: Age of the Rampant" (South Korea), "Cannibal" (Spain), "NOVA: Rise of the Hackers," "Nuclear Nation" (Japan), "The Scribbler," "A Woman in Flames" (1983, Germany), "The Search for Simon," "The Squad" (Spain), "Autumn Blood," "Play Hooky" and "Uranium Drive-In."

Television series: "Downton Abbey Seasons 1, 2, 3 & 4," "Mad Men: The Final Season, Part 1," "The Soul Man: Second Season," "Pee-wee's Playhouse: The Complete Series," "Duck Dynasty: Seasons 4-6 Gift Set" and "Annie Oakley Complete TV Collection."