The plot of Stranger Things seems pretty straightforward to me, and yet there are quite a few questions purposefully left unanswered, which fans are happy about because that means we get a second season.
But one question remained on my mind well after I finished binge watching the first season- what is Eleven's relationship to the monster the kids call the Demogorgon?
This fan theory video from the UPROXX series IN THEORY may explain it all. (Contains spoilers)
Hopefully this fan theory doesn't make the Duffer brothers change gears because the show has been great so far!