Netflix's hit series "Stranger Things" returns for a second season on Friday.
In case you haven't had time to binge the first season again, we're here to remind you of all the key details from the finale. "Stranger Things 2" picks up nearly one year later, but retreads storylines from the past that you'll definitely want to remember.
Keep reading for a look at where the first season left off.
After making a deal with Hawkins Lab, Hopper and Joyce entered the Upside Down to rescue Will.
Hopper and Joyce were caught trying to break into Hawkins Lab, so Hopper made the secretive government agents a deal: If he could enter the Upside Down to save Will, then Hopper would tell them where to find Eleven.
Joyce and Hopper went into the Upside Down and rescued Will, while the Hawkins Lab leaders headed to the middle school where Eleven was hiding with Mike, Dustin, and Lucas.
While in the Upside Down, Hopper had a series of flashbacks to his daughter's illness and eventual death.
By the season one finale, it was clear Hopper was carrying the weight of grief with him over his daughter Sarah's untimely death. His resolution to find and rescue Will seemed to stem from the fact that he was unable to save his own child years ago.
Though the first season of "Stranger Things" never explained what exactly happened to Sarah, David Harbour (Hopper) said her cause of death is something that will be explored with his character on future seasons.
Barbara Holland was found dead in the Upside Down, and five others went missing but weren't acknowledged in the finale.
Barb was taken by the Demogorgon into the Upside Down after Nancy semi-abandoned her during a small party at Steve Harrington's house. Barb wasn't as lucky in the Upside Down as Will — the Demogorgon killed her and appeared to be using her body to slowly feed.
While a lot of attention was paid to Will on the finale, not much was said about Barb's death nor the other reported missing people who were likely snatched by the Upside Down's monster. But don't forget, the Hawkins Lab agents staged clues (like putting Barb's car at a bus station) to make it look like she had simply run away.
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