The Mind Flayer
Just because we're going into season three after a time jump, don't assume we're done with the creatures contained in season two. Ross Duffer revealed in an interview that the ominous final shot of season two is a hint at what's to come. "They've shut the door on the Mind Flayer, but not only is it still there in the Upside Down, it's very much aware of the kids, and particularly Eleven," he teased. "It had not encountered her and her powers until that final episode. Now, it knows that she's out there. We wanted to end on a little bit of an ominous note on that level." Get ready for round two with the big ol' smoke monster, everyone.
Of course, things are never easy for our young heroes, so the Mind Flayer isn't the only evil they'll have to face. Levy insinuated that another evil, one that's entangled with this monster, is on the approach. "It's definitely an evil related to [the monster's] agenda, which we learn more about in season three," Levy confirmed. It's never a quiet day in Hawkins.