Sadie Sink in the MCU? Her casting has been confirmed for months, but a new leak might finally reveal who she’s playing in Spider-Man: Brand New Day. And if it’s true, it’s a perfect match.
Film insider Kristian Harloff recently claimed there’s a “pretty good guarantee” that the Stranger Things breakout will play Gwen Stacy, the smart, confident, emotionally complex fan-favorite who’s made waves across comics, animation, and two previous live-action Spider-Man franchises. While Marvel has yet to confirm anything, the theory immediately set off speculation online—and we can see why.
Who is Gwen Stacy, and why do fans think Sadie Sink is playing her?
For casual fans, Gwen might just seem like “the other girl” in Peter Parker’s love life when Mary Jane Watson isn’t around. But longtime readers know she’s so much more. Introduced in 1965, Gwen was Peter’s classmate and first great love up until her tragic death at the hands of the Green Goblin changed comic book history forever.
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In the years since, she’s reemerged in new forms: from Bryce Dallas Howard’s emo-banged version in Spider-Man 3 to Emma Stone’s magnetic take in The Amazing Spider-Man films, and most recently, the multiverse-hopping hero Spider-Gwen in Across the Spider-Verse. She’s brains, heart, and (sometimes) superpowers all rolled into one of the most beloved women in Marvel lore.
So when fans heard Brand New Day might follow Peter to college? Gwen made perfect sense. And Sink? Even more so.
Why Sadie Sink makes perfect sense for the role
With her breakout as Max in Stranger Things—a role she portrays with equal parts fearlessness and vulnerability in a spectacular way—Sink proved she can handle the emotional range Gwen demands. She’s got the presence to share the screen with Tom Holland, and the edge to give Gwen the kind of voicey, modern update that resonates with today’s audiences.
Any Stranger Things fan knows that Sink is no stranger to intense genre storytelling. Her fresh take on Gwen Stacy may not be confirmed yet, but if the rumors are true, Spider-Man: Brand New Day might have just found its secret weapon.
Why Sadie Sink’s Rumored Role in ‘Spider-Man: Brand New Day’ Is Perfect for Her first appeared on Men’s Journal on Aug 8, 2025
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