Stranger Things star Sadie Sink is set to appear in Spider-Man 4, and her mysterious character might come from a surprising source.

Sadie Sink is joining the Marvel Cinematic Universe. The “Stranger Things” star has been cast in “Spider-Man 4,” in which she’ll share the screen with Tom Holland as the web-slinging Avenger. It’s unclear who Sink will portray in the comic book adventure,

By now, you've heard the news that Stranger Things star Sadie Sink has joined the cast of Spider-Man 4 alongside Tom Holland. But while fans mull over which fictional red head the 22-year-old actor is going to play—the most popular theory is probably X-Men's Jean Grey—they'll still have to wait for Spidey to stop filming Christopher Nolan's adaptation of The Odyssey before production of the Marvel x Sony project can even begin.