Stranger Things alum Sadie Sink will be joining the film in a mystery role. Other than Tom Holland, who will be reprising his role as Peter Parker, Sink is the only confirmed cast member. Naturally, the Internet has been speculating about who Sink could be playing — is she a new take on Gwen Stacy,

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 teenaged, web-slinging Avenger. It’s unclear who Sink will portray in the comic book adventure, though Deadline, which first reported the casting news, hinted that her role …