Here's everything to remember before watching Stranger Things season 4

If you need a recap of all the stuff from season 3, We have you covered. Before diving into the new episodes, here are the most important things to remember.

The first, and probably most important, thing to know is that when season 4 begins, the series' core group of friends has all dispersed.

Joyce Byers (Winona Ryder) finally packs up and moves Jonathan (Charlie Heaton) and Will (Noah Schnapp) out of Hawkins and to sunny California after three seasons of unimaginable horrors befalling her family.

Eleven (Millie Bobby Brown) has nowhere to go because of Hopper's presumed death (more on that later), so she joins the Byers family on their move.

It's safe to say that Hawkins' horrors didn't deter anyone from finding love, because by the end of season 3, it appeared that everyone had found love.

Mike (Finn Wolfhard) and Eleven had finally confessed their feelings for each other, with Mike promising El he'd pay her a visit for Thanksgiving and she'd pay him a visit for Christmas.

By the end of the season, Max (Sadie Sink) and Lucas (Caleb McLaughlin) were still together. When it appeared that new-found besties Robin (Maya Hawke) and Steve (Joe Keery) were sparking, she came out to him in a surprisingly tender bathroom moment.

Nancy (Natalia Dyer) and Jonathan are experimenting with long distance relationships as a result of the Byers' move (they hilariously agreed during their tearful goodbye that they've survived worse), and even Dustin (Gaten Matarazzo) surprised everyone when it was revealed that Suzie (Gabriella Pizzolo), his suspicious long-distance girlfriend he met at camp, turned out to be a real person.

'After a fierce battle between Eleven and the Mind Flayer, the evil entity is finally driven back behind the barrier that separates this world from the Upside Down (for now). But, by the end of Season 3, it appeared that El's powers had worn out. "I don't have my powers," she says in the Season 4 trailer.

The season 3 concludes with a prison of some kind in Russia, where it is revealed that the Soviets have their very own demogorgon, which they cannot possibly be using for good.

When Joyce is forced to detonate their explosive before he can escape, Hopper appears to explode himself in an attempt to stop the Russians by blowing up their Upside Down machine. However, Hopper has been seen in some of the season 4 promos, indicating that we haven't seen the last of him.

Billy (Dacre Montgomery), the character everyone loves to hate, died during the Battle of Starcourt when he finally remembered who he was after being possessed by the Mind Flayer all season and forced to do its dirty work.

In a surprising redemption arc, Billy sacrificed himself to protect El, Max, and the gang from the possession. "I'm sorry," he says to his step-sister, Max, in his final words.