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How did Hopper survive? And was his daughter's death linked to the Hawkins National Lab?
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The first three seasons of Netflix's "Stranger Things" have increasingly pulled back the curtain on the mystery around a supernatural force stalking the town of Hawkins, Indiana. But the third season complicated everything with a Russian spy presence, the not-so-final "death" of Hopper, and more mysterious behavior from the Mind Flayer.
We're here to parse through all the biggest unanswered questions raised throughout these first three seasons, and what these mysteries could mean for the upcoming fourth season of "Stranger Things."
Keep reading to see which burning questions fans should be mulling over.
Where is Dr. Brenner in the present timeline?
Matthew Modine plays Dr. Brenner on "Stranger Things."Netflix
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How many other numbered children were kept at HNL? Are they still alive?
Kali has powers, just like her "sister" Eleven.Netflix
Why did Hopper get into that unmarked black car after leaving the hospital on the first season finale?
Hopper looked very mysterious here.Netflix
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Is Hopper's first daughter's death linked to Hawkins National Lab?
Sara and Hopper together in one of his flashbacks from season one of "Stranger Things."Netflix
How did the Russians know about the Upside Down? Was their discovery accidental?
The third season of "Stranger Things" opens with a scene which takes place before the events of season two.Neflix
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Was the underground Russian lab just really far beneath the HNL gate? Or in a different spot entirely?
The geography of the mall and the lab isn't made clear on "Stranger Things 3."Netflix
Who was watching the security cameras inside HNL?
The security camera beeping inside Hawkins National Lab on "Stranger Things 3."Netflix
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Is there only one alternate dimension? Or others beyond the Upside Down?
Will Byers (played by Noah Schnapp) on the first season of "Stranger Things."Netflix
How many people died in Hawkins last season?
Dead patients at the Hawkins hospital.Netflix
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The news story shown at the end of "Stranger Things 3" only accounts for 30 people dead in a "fire" — but how will the government explain the hospital massacre?
One of the newspapers published in Indiana following the Battle of Starcourt.Netflix
What was up with the fertilizer and chemicals? Is that just supposed to be what helps the people explode?
The chemicals being eaten by the Holloway family on "Stranger Things 3."Netflix
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What was the green stuff powering the Russian machine?
Erica and Dustin found a whole room full of the green goop.Netflix
Why was there a big Demogorgon-sized cage in the Russian lab?
Erica spotted this cage in the Russian's secret lab.Netflix
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What happened to the first Demogorgon when Eleven "killed" it?
Eleven and the Demogorgon on the first season finale of "Stranger Things."Netflix
Whatever happened to the Demodog Steve put in Joyce's fridge at the end of season two?
Steve and the Demodog on "Stranger Things 2."Netflix
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How are the Mind Flayer and the Demogorgon linked?
The Mind Flayer is the creature in charge of the Upside Down.Netflix
Where did all the Russians go and how did they escape without detection?
The US Army running into the Russian lab underneath Starcourt Mall.Netflix
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What will Dr. Owens and the US government do about this massive security breach?
Paul Raiser's character was first introduced last season.Netflix
What are the Russians doing in that prison complex we saw in the mid-credits scene?
A man being held prisoner in Russia in the "Stranger Things 3" mid-credits scene.Netflix
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Last but perhaps most importantly, will Eleven's powers come back? And why did they leave in the first place?
Eleven using her mind powers on "Stranger Things 3."Netflix