"If you've enjoyed season four up until this point, get ready because the (last two episodes) are the best thing that makes what you've seen look like chump change compared to it," Harbour told Reuters.

"It's a masterpiece, it's beautiful, it's epic... but it's also on a scale and a scope that almost gets silly and it's like wondrous, almost manga-esque... You're going to be blown away."

Harbour also talked about the huge fame he got after Stranger Things. "It's a zeitgeist. I've never been a part of anything like this but it has been seven years of this, so I've gotten used to what it means and my place in it. It's very gratifying to be a part of something that's touched...so many young people...I always thought I'd maybe have some career of art films that would maybe appeal to old people and suddenly...I can't walk past a middle school without being harassed so it's a very strange thing for me to be a part of."