Thanks to the new Stranger Things documentary, Stranger Things: One Last Adventure, we learned why there were no demogorgons present in the Stranger Things finale.

With Netflix's Stranger Things now over and done, let's take a look back at the Upside Down's most terrifying monsters. Here they are, ranked.

Netflix's 'One Last Adventure: The Making of Stranger Things 5' documentary left fans reeling over the writers' Demogorgon debate ahead of finale.

Stranger Things Season 5, Episode 8 had a Demogorgon-sized plot hole in The Abyss, and one writer thought they should've been with Vecna.