Since "Stranger Things" last released new episodes in 2022, a lot has happened. The writers' and actors' guilds went on a historic strike, delaying production on the final season. The Duffer Brothers, as the show's creators Matt and Ross are known, developed a stage play set in the "Stranger Things" world that premiered on London's West End and transferred to Broadway earlier this year. The star, Millie Bobby Brown, who was 12 when the show premiered, became a wife and mother.

The time between the fourth and fifth seasons is long enough that many fans — save the ones who have been faithfully rewatching and carefully taking notes in preparation — may not remember what happened last. And key context and developments from earlier seasons may be even fuzzier in our memories, like Eleven trying to recall what happened in the rainbow room.

Let's refresh our memories together.

"Stranger Things," set in fictional Hawkins, Indiana, (primarily) in the 1980s, follows a ragtag bunch of kids and a handful of trusted adults as they battle evil and supernatural forces in their small town. High school students Will (Noah Schnapp), Mike (Finn Wolfhard), Lucas (Caleb McLaughlin), Dustin (Gaten Matarazzo) and Max (Sadie Sink), along with older teens Nancy (Natalia Dyer), Jonathan (Charlie Heaton), Steve (Joe Keery) and Robin (Maya Hawke), work alongside Eleven (Brown), a girl with special psychokinetic abilities, to protect the town from a parallel dimension called the Upside Down with monsters, electrical storms and a Lovecraftian, other-worldly force. Joining them in the fight is Joyce Byers (Winona Ryder), Will and Jonathan's mom, police chief Jim Hopper (David Harbour) and a handful of other instrumental characters.

Here's a recap of the important storylines to remember, a refresher on where the series left off and everything else you need to know to prepare for the fifth and final season that will be released in three installments, beginning with Vol. 1 on Nov. 26, Vol. 2 on Christmas Day and the finale on New Year's Eve.

Where we left off

Season 4 of "Stranger Things" concludes in a dark place, literally.

Vecna, the main antagonist from Season 4, had been seeking out four victims whose deaths would open four gates to the Upside Down. Although his final victim, Max, was only dead for a minute (more on that later), he succeeded. The gates converge at the center of Hawkins, culminating in a large boom at the Hawkins Public Library. Although it's dismissed by officials as an earthquake, our gang knows better — the Upside Down is merging with the real world.

The final moments of the season show dark clouds billowing through the sky as the familiar, dandruff-like particles from the Upside Down float through the air. Earlier in the season, Vecna possessed Nancy, showing her a terrifying vision of mass death and destruction in Hawkins and the four gates to the Upside Down ripping through the town. These are just a few steps in his mission to destroy humanity.

At the end of the season, we also see the long-anticipated return of Hopper, who was trapped in a Russian prison until Joyce and Murray Bauman (Brett Gelman), their mutual friend and a private investigator, help break him out and bring him back home. Eleven and Hopper, who have a father-daughter-like bond, reunite in one of the bright spots of an otherwise dark season.

And although he achieved his goal, Vecna is weak. Nancy, Robin and Steve set his body on fire while he was attacking Max, who was in a trance. Fearless Nancy then shoots him repeatedly until he falls out of the second story of his lair. Although it seems at first that they have killed him, his body is gone by the time the crew rushes to the ground floor, and Will senses that he is still alive.

Characters who died in Season 4

Max Mayfield (sort of)

Vecna preyed on Max for much of Season 4, and in the final episode, playing Kate Bush's "Running Up That Hill" on repeat from her Walkman is not enough to save her. Vecna kills Max, but Eleven is able to revive her by using her powers to restart her heart. The last shot we see of Max is of her hospitalized in a coma, with broken bones and her concerned friends by her side.

She's alive, but her temporary death was enough for Vecna to accomplish his goal. Theories about whether Max's consciousness is trapped in Vecna's visions, or if she will recover with powers that enable her to spy on Vecna, have been circulating on social media since the release of Season 4, but fans of the character shouldn't fret. Sink is listed in the credits for Season 5 and she is seen briefly in the Season 5 trailer, with Lucas carrying her body as a Demogorgon, one of the monsters in the show, runs toward them.

Although he died in the Season 3 finale, Billy Hargrove, Max's stepbrother, is noteworthy since his death took a big emotional toll on Max, filling her with guilt and grief, which primed her to be one of Vecna's targets.

Eddie Munson

This fan-favorite character played by Joseph Quinn died in the final episode of Season 4, but he went out with a blaze. Eddie and Dustin were in the Upside Down carrying out their part in the plan to attack Vecna, and Eddie shredded out Metallica's "Master of Puppets" on his guitar in order to distract the Demobats protecting Vecna's lair. Dustin says the musical ruse is the "most metal ever," but it's not enough to keep them safe from the terrifying creatures.

After Dustin makes it through the gate back into the real world, Eddie stays behind to drive the bats away and buy the group more time. He is eventually attacked by the creatures, and dies in Dustin's arms after protecting his friends.

Eddie initially befriended Mike, Lucas and Dustin because of their shared love of Dungeons & Dragons, forming the Hellfire Club to play the game together. Eddie's death is likely to reverberate with Dustin in the upcoming season, who is seen in the trailer wearing his Hellfire Club T-shirt.

Dr. Martin Brenner

Dr. Brenner, or Eleven's "papa" as his test subjects called him, was killed by military gunfire when officers invaded his research facility in search of Eleven. They believed she was behind the strange happenings and murders taking place in Hawkins.

Brenner (Matthew Modine) played a significant role in the controversial MKUltra program, a real-life covert CIA mind-control and chemical interrogation research program. He took a young Henry Creel (who ultimately became 001/Vecna) into his custody after discovering he possessed psychokinetic abilities and tried to replicate those abilities in other children, including Eleven.

In his final moments, Brenner tells Eleven he is proud of her and that all he ever wanted was to help her and protect her, despite the psychological and physical abuse he inflicted on her.

Other important things to remember

Will's connection to the Upside Down

Since he was trapped in the Upside Down during Season 1, Will hasn't been able to sever his tie to the dimension. In Season 2, he is possessed by the Mind Flayer and feels pain when the vines in the Upside Down are damaged or Demogorgons are hurt. He is tapped into the dimension's "hive mind" and can sense Vecna's presence, usually through a strange feeling on the back of his neck.

Eleven's 'sister'

Although all of the test subjects who were raised alongside Eleven were killed by Henry/001 in the massacre at Hawkins Labs (Season 4, Episode 7), one of her "siblings" managed to escape the lab before that fateful day. Kali, or 008, made a brief appearance in a Season 2 storyline — Eleven temporarily joined her gang of misfits to help in Kali's mission of getting revenge on people who worked in the lab.

Kali did not appear in Seasons 3 or 4, but aside from Eleven and Henry/Vecna, she is the only other person known to have powerful psychokinetic abilities.

'The First Shadow'

The stage play "Stranger Things: The First Shadow" is a prequel diving into Henry's origins and how he eventually became 001, and Vecna. Although it is considered a stand-alone work, the Duffer Brothers collaborated with "Stranger Things" writer Kate Trefry to create the play's story and they have confirmed it is canon in the "Stranger Things" universe.

Some fans who have compared the details from the play and the series say that the play suggests Vecna might not be in control of the Mind Flayer, as he has suggested. Rather, the Mind Flayer is in control of him, or that it had at least corrupted his human self.

Fans who have traced back through the series to see if this theory holds water point out that Dustin, whose theories about the Upside Down tend to be correct, suggested the same thing in Season 4. Speaking about the Mind Flayer, he says, "If the Demogorgon was just his foot soldier, Vecna's his five-star general."

What we know is coming next

Netflix released the first five minutes of the new season in early November, in which we see a flashback to Will's time trapped in the Upside Down. A Demogorgon drags an unconscious Will to Vecna's lair, and Vecna ominously says they can begin their work "at long last." "You and I, we are going to do such beautiful things together, William," he continues.

It looks like we can expect a showdown between our heroes and Vecna, but it's possible we might also get further explanation about why Will was specifically targeted from the beginning.

Is this the end of 'Stranger Things'?

In a word, yes. But new stories taking place in the world of "Stranger Things" will be coming. Netflix recently unveiled the first look at an animated spinoff series, "Stranger Things: Tales From '85." The series is set between the events of Seasons 2 and 3, and it will feature the main characters fans know and love. The Duffer Brothers collaborated with showrunner Eric Robles to create the series, which does not have a premiere date yet.

The Duffer Brothers are also developing a spinoff series with new characters and a "clean slate," which they teased in a recent interview with Variety.

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