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Every month, subscription streaming services add a new batch of movies and TV shows to their libraries. Here are the titles we think are most interesting for October, broken down by service and release date. Streaming services occasionally change schedules without giving notice.

New to Netflix

Ethan Hawke and Julie Delpy in "Before Midnight." Despina Spyrou/Sony Pictures Classics

‘Before Midnight’

Starts streaming: Oct. 1

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Richard Linklater’s “Before” series has watched Celine (Julie Delpy) and Jesse (Ethan Hawke) meet in “Before Sunrise,” fall into lasting love in “Before Sunset” and in the trilogy’s finale, “Before Midnight,” deal with the consequences of getting what they wanted. Now that the flirtatious energy has faded, is there anything left for Celine and Jesse to hold onto? “Before Midnight” may feel like the most authentic chapter in the Linklater’s romantic saga, but it can also be a little too raw and honest for some.

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Garance Marillier in “Raw.” Focus World

‘Raw’

Starts streaming: Oct. 4

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Justine (Garance Marillier), a misfit academic prodigy and a lifelong vegetarian, is forced to eat her first piece of meat during rush week at veterinary school, leading her to discover a taste for all things warm and bloody, including human flesh. This debut feature from Julia Ducournau mixes adolescent anxiety and gory horror in a darkly funny manner. Ducournau sets up a stylish hellscape of a school, with the lighting of a Dario Argento movie and the psychosexual undertones of a David Cronenberg film.

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Naomi Watts, center, in “While We’re Young.” Jon Pack/A24

‘While We’re Young’

Starts streaming: Oct. 23

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Noah Baumbach and Ben Stiller collaborated on this quirky generational comedy, in which Stiller plays half of a middle-aged couple (with Naomi Watts) who befriend a hip millennial pair (Adam Driver and Amanda Seyfried) and start to idolize their carefree lifestyle. Understandable, perhaps, except that the young couple naturally has its share of problems, too.

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Samuel L. Jackson in “The Hateful Eight.” Andrew Cooper/Weinstein Company

‘The Hateful Eight’

Starts streaming: Oct. 25

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O.K., so you won’t be able to experience it in its 70 millimeter glory, but this bloody and profane western from Quentin Tarantino should do just fine on the biggest screen you own. It’s a very interior movie. A killer cast — Jennifer Jason Leigh, Walton Goggins, Bruce Dern, Samuel L. Jackson, Tim Roth, Michael Madsen, Kurt Russell — are cooped up in either a stagecoach or a snow-battered cabin for most of the movie, trading barbs, bullets and foul language. You might want to find the comfiest seat you own — the movie is almost three hours long.

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Also of Interest: “Boogie Nights” (Oct. 1), “Eagle vs. Shark” (Oct. 1), “Miss Congeniality” (Oct. 1), “Eyes Wide Shut” (Oct. 1), “Donnie Darko” (Oct. 11), and “Meet the Robinsons” (Oct. 23).

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Netflix Original Movies

Marsha P. Johnson in “The Death and Life of Marsha P. Johnson.” Netflix

‘The Death and Life of Marsha P. Johnson’

Starts streaming: Oct. 6

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At first glance, I thought this was going to be a straightforward documentary about one of the first leaders of the movement for L.G.B.T. equality. But the director David France (“How to Survive a Plague”) took a different approach. Instead, he followed Victoria Cruz, an activist working to solve the mysteries surrounding the death of Marsha P. Johnson. Through Cruz’s investigation, Johnson’s story comes to life and throws a spotlight on the dangers still faced by transgender people.

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From left, Grace Van Patten, Ben Stiller, Adam Sandler and Elizabeth Marvel in “The Meyerowitz Stories.” Netflix

‘The Meyerowitz Stories (New and Selected)’

Starts streaming: Oct. 13

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Harold (Dustin Hoffman), a retired professor and sculptor, barely remains in touch with his three children, Danny (Adam Sandler), Matthew (Ben Stiller) and Jean (Elizabeth Marvel). Each of his kids harbors some resentment toward their father’s messy parenting, and their relationship with Harold is tested when he falls ill. There’s so much to love about this bittersweet comedy from writer-director Noah Baumbach, including Emma Thompson as the drunk stepmother and Sandler, in his best performance since “Punch-Drunk Love.”

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Joan Didion at home in Hollywood. Julian Wasser, via Netflix

‘Joan Didion: The Center Will Not Hold’

Starts streaming: Oct. 27

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For the past several years, the actor Griffin Dunne has been working on this documentary about his celebrated aunt, the writer Joan Didion, digging through the family archives and conducting extensive interviews in order to tell the story of how she pioneered a new kind of literary essay. Just as the author’s work does, Dunne’s doc aims to combines the personal and the reportorial, with cameos by a multitude of famous folk from the 1960s to now.

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New Netflix Original TV Series

Alessandro Borghi in “Suburra.” Emanuela Scarpa/Netflix

‘Suburra’

Starts streaming: Oct. 6

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Some of the team behind the recent TV adaptation of the Italian organized crime saga “Gomorrah” have turned another hard-hitting movie about mob corruption into a series. “Suburra” looks at how politicians and gangsters trade favors and bring violence and misery to the locals while developing a seaside community outside Rome into a gambling resort.

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Jonathan Groff, center, in “Mindhunter.” Patrick Harbron/Netflix

‘Mindhunter’

Starts streaming: Oct. 13

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Back in 2013, producer-director David Fincher helped launch Netflix’s first big hit original series, “House of Cards.” He now returns to the streaming service with a unique true-crime procedural, recalling his movie “Zodiac.” Based on the real-life cases of the F.B.I. profilers whose work in the 1970s helped inspire Thomas Harris’s Hannibal Lecter novels, “Mindhunter” stars Jonathan Groff and Holt McCallany as daring federal agents, pioneering the method of interviewing serial killers to catch serial killers.

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Gaten Matarazzo, left, Finn Wolfhard, Caleb McLaughlin and Noah Schnapp in the original Netflix series “Stranger Things.” Jackson Lee Davis/Netflix

‘Stranger Things’ Season 2

Starts streaming: Oct. 27

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Netflix has had popular series before, but none that permeated popular culture as quickly and thoroughly as this 1980s science-fiction/fantasy/horror homage from Matt and Ross Duffer has. The second season of “Stranger Things” will reportedly jump ahead a year, to October 1984, and will dig deeper into the mystery of the monster-ridden dimension known as the Upside Down, documenting how strange supernatural occurrences are affecting the plucky kids and melancholy adults of the eternally autumnal Hawkins, Ind.

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New to Amazon Prime

Alicia Silverstone, left, and Stacey Dash in “Clueless.” Paramount Pictures

‘Clueless’

Starts streaming: Oct. 1

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Dig up the ’90s mixtape that is “Clueless,” rock out to the Mighty Mighty Bosstones, and wear the choker that’s stuffed away at the bottom of your drawer. Updating Jane Austen’s “Emma” to Beverly Hills High, “Clueless” follows a popular but misguided teen (Alicia Silverstone), who teams up with her best friend (Stacey Dash) to give the awkward new girl (Brittany Murphy) the perfect high-school makeover.

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Reese Witherspoon in “Election.” Bob Akester/Paramount Pictures

‘Election’

Starts streaming: Oct. 1

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Who could have guessed that this black satire from Alexander Payne about an overachieving student (Reese Witherspoon) and the jealous teacher (Matthew Broderick) hellbent on ruining her perfect campaign for class president would remain so relevant? The movie also digs at the deep-seated misogyny of Jim McAllister (Broderick) and the insufferable type-A personality of Tracy Flick (Witherspoon). Everyone is fair game for ridicule.

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Thora Birch, left, and Scarlett Johansson in “Ghost World.” United Artists

‘Ghost World’

Starts streaming: Oct. 1

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Before Scarlett Johansson was a member of the Avengers, she played Rebecca, Enid’s tragically hip best friend in this adaptation of the Daniel Clowes graphic novel. Rebecca and Enid (Thora Birch), both recent high school grads, are too cool for just about everyone except an older weirdo (Steve Buscemi), whom Enid considers a kindred spirit. Rebecca, however, treads a more predictable path, and the girls’ friendship comes to an impasse. The movie uses the comic’s bright color palette and cartoonish overreactions to help make these lovable dorks cool.

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Brooke Adams and Donald Sutherland in “Invasion of the Body Snatchers.” MGM

‘Invasion of the Body Snatchers’

Starts streaming: Oct. 1

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To kick off the season of all things scary, let’s dig up one of the better remakes Hollywood has ever produced. In the 1978 version of “Invasion of the Body Snatchers,” Matthew (Donald Sutherland) is a local health inspector whose co-worker Elizabeth (Brooke Adams) thinks her boyfriend is acting odd. He is, and he’s not alone: Alien spores that duplicate humans as “pod people” devoid of emotions have spread through San Francisco. The aliens can only make the swap as their victims sleep. To survive, people have to stay awake and vigilant. Forever.

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Frances McDormand in “Fargo.” Gramercy Pictures

‘Fargo’

Starts streaming: Oct. 1

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If you love the FX series of the same name, I sure hope you’ve seen the Coen brothers’ original. In their feature film, a car salesman (William H. Macy) hires two criminals (Steve Buscemi and Peter Stormare) to kidnap his wife in order to squeeze some ransom money from his father-in-law. And it might have worked if it weren’t for one of the best, most dogged cops in movie history, the very pregnant Marge (Frances McDormand). It’s as darkly funny as they come.

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Christian Bale in “The Machinist.” Nicolas Gellar/Paramount Classics

‘The Machinist’

Starts streaming: Oct. 1

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An insomniac and former factory worker (Christian Bale) is haunted by an unfamiliar face and is isolated by the people around him as his condition consumes his body and his mind. It only gets more grim from there as he finds he must track down this strange man he doesn’t recognize. While it’s not necessarily a scary movie, what Bale did to his body to achieve his emaciated look is pretty horrifying.

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A scene from “Arrival.” Paramount Pictures

‘Arrival’

Starts streaming: Oct. 28

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This deliberately paced sci-fi movie from director Denis Villeneuve (“Sicario,” the coming “Blade Runner 2049”), is more concerned with ideas, mood and emotion than it is with explosions or rousing action scenes. Amy Adams plays a linguistics professor hired by the United States government to communicate with the inhabitants of a fleet of alien spacecraft and figure out what they want before other earth leaders decide to declare war on the extraterrestrial invaders. It’s a bit like “Close Encounters of the Third Kind,” if we spent more time inside the spacecraft.

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New to Hulu

From center left, Dick Enberg and Warren Beatty in “Heaven Can Wait.” Paramount Pictures

‘Heaven Can Wait’

Starts streaming: Oct. 1

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Warren Beatty plays Joe, a quarterback for the Los Angeles Rams, who is accidentally taken from his body too early by an angel and must find another body to occupy until the whole mess is sorted out. This is a delightfully silly ’70s comedy, featuring a reunion between a big-haired Beatty and his “McCabe and Mrs. Miller” co-star Julie Christie, who plays Beatty’s environmental-activist love interest. Beatty directed “Heaven Can Wait” with Buck Henry, the screenwriter and actor who also appears as the movie’s overeager angel.

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Ellen Greene in “Little Shop of Horrors.” Warner Bros.

‘Little Shop of Horrors’

Starts streaming: Oct. 1

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In this colorful horror-comedy musical, Seymour (Rick Moranis) is a dweeb obsessed with plants and is nursing a crush on his co-worker Audrey (Ellen Greene). He comes across an alien plant that begins to talk and request human flesh for food. The Muppet master Frank Oz directed the film and brought the monstrous man-eating plant, Audrey II, to life. (Side note: Is anyone else bothered by Seymour’s naming his carnivorous plant after his crush?)

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Meryl Streep, left, and Shirley MacLaine in “Postcards From the Edge.” Columbia Pictures

‘Postcards From the Edge’

Starts streaming: Oct. 1

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Few mother-daughter movies are as dark as this one. Written by Carrie Fisher (and based on her novel), “Postcards” follows an actress with a drug problem (Meryl Streep) and the chaos that ensues after she’s forced to live with her actress mom (Shirley MacLaine). Loosely based on Fisher’s tumultuous relationship with her mother, Debbie Reynolds, this movie by Mike Nichols goes into some pretty rough territory, even if it is fun to watch Streep and MacLaine butt heads. Plus, it’s the rare movie in which Streep plays the bad girl.

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Carmen Maura, left, and Penélope Cruz in “Volver.” Sony Pictures Classics

‘Volver’

Starts streaming: Oct. 1

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A family tragedy reveals secrets in a way that only happens in Pedro Almodóvar dramas. Two sisters must deal with the death of their aunt and the ghost of their mother, who has come back from the grave with a mission. Penélope Cruz is delightful to watch as she leads this female-heavy cast through this film’s colorful sets and fanciful problems.

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Also of interest (Oct. 1 unless otherwise stated): “The Amityville Horror,” “A Fistful of Dollars,” “Clueless,” “Election,” “Escape From Alcatraz,” “Gandhi,” “Ghost World,” “Invasion of the Body Snatchers,” “March of the Penguins,” “Philadelphia,” “Pieces of April,” “Kill Bill Vol. 1 & 2,” “Pride,” “Reds,” “Road House,” “Swingers,” “Like Water for Chocolate” (Oct. 15), “The Crying Game” (Oct.15), “Arrival” (Oct. 28), and “Midnight Express” Oct. 31.

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New to HBO

Tilda Swinton in “Constantine.” Warner Bros.

‘Constantine’

Starts streaming: Oct. 1

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Not all heroes wear capes, and neither do all comic book adaptations. The titular detective, specializing in the occult and exorcisms, is one of Keanu Reeves’s most bizarre and wildly entertaining roles. This supernatural world also features Rachel Weisz, Shia LaBeouf, Djimon Hounsou and Tilda Swinton as an androgynous angel.

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A scene from “The Sandlot.” 20th Century Fox

‘The Sandlot’

Starts streaming: Oct. 1

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Just as the last bit of summer warmth leaves the air, tap into the sweet nostalgia of a ’60s suburban childhood, where kids could play unsupervised for hours and the only threat was the big neighborhood dog who claimed every ball that came over his fence. “The Sandlot” has become a bit of a cult family hit over the years, and now those born in the ’90s are beginning to share this movie with a new generation.

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Keanu Reeves in “John Wick: Chapter 2.” Niko Tavernise/Lionsgate

‘John Wick: Chapter 2’

Starts streaming: Oct. 21

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You don’t need to know what happened in the first “John Wick” movie before watching the sequel. What you do need to know is that the movie stars Keanu Reeves in peak silent-killer form, loads of hand-to-hand combat and stylishly lit chase sequences in glamorous locales. (Also, no dogs die this time around.)

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Foreground, Anya Taylor-Joy and James McAvoy in “Split.” John Baer/Universal Pictures

‘Split’

Starts streaming: Oct. 28

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In M. Night Shyamalan’s latest thriller, a troubled man (James McAvoy) struggles to keeps his 23 different personalities at bay. When a few of the more dangerous ones finally overthrow his mind, he kidnaps three teenage girls, who must figure out how to escape. McAvoy shows off his acting chops by playing several different characters in the same body, and Anya Taylor-Joy (“The Witch”) is fantastic as a particularly resourceful teen. “Split” is unnerving, strange and leaves you with plenty to talk about after the movie.

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Noel Murray contributed reporting.