The official teaser trailer for Season 5 previews a final battle with Vecna, whose complex origin story is the focal point of the play "Stranger Things: The First Shadow."

Did you know that Stranger Things was originally going to kill off two fan-favorite characters and that a Bridgerton star lost out on a major role?

For those wanting to catch up before the last season ever, Stranger Things Seasons 1 to 4 are available to stream on Netflix right now, with the final Season 5 set to premiere in three parts between November 26th and December 25th, with the finale releasing on December 31st.