Black MirrorIf you're a fan of the techno-thriller anthology series "Black Mirror," you probably know not to watch it at night. Or alone. Well, even these descriptions of Season 3's episodes, which will stream on Netflix starting Oct. 21, are pretty spooky.

"Black Mirror" showrunner Charlie Brooker shared the synopses with Entertainment Weekly, and as usual, the episodes continue to explore how technology messes with people's heads. Read for details ... with the lights on:

"Nosedive": An insecure office worker (Bryce Dallas Howard) lives in a world in which everyone obsessively ranks and rates every tiny social interaction. She thinks she finally may have found a way to rank alongside her friend (Alice Eve), who's one of society's elites.

"San Junipero": This 1980s-set tale stars Mackenzie Davis and Gugu Mbatha-Raw as recent arrivals to a beach town "synonymous with sun, surf, and sex."

"Shut Up and Dance": A withdrawn 19-year-old (Alex Lawther) stumbles headlong into an online trap and is quickly forced into an uneasy alliance with a shifty man (Jerome Flynn) who are both at the mercy of persons unknown. Brooker describes it as "a kitchen sink nightmarish thriller."

"Men Against Fire": A military story set in a post-war future. A rookie soldier (Malachi Kirby) is posted overseas, protecting frightened villagers from an infestation of vicious feral mutants alongside fellow soldier Raiman (Madeline Brewer). They're hoping some new technological advantage will save them.

"Playtest": A thrill-seeking globetrotter (Wyatt Russell) visits Britain, hooks up with a woman (Hannah John-Kamen) and tests the latest in video game technology -- "a device as mind-bendingly sophisticated as it is terrifying," Brooker says.

"Hated in the Nation": The show's first-ever 90-minute episode; a crime drama inspired by Scandi-Noir thrillers like "The Killing" and "Borgen." A police detective (Kelly McDonald) and her geeky young sidekick investigate a string of grisly murders with a sinister link to social media.

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