Who Will Sadie Sink Play in Spider-Man: Brand New Day?

Forget spoilers. Sadie Sink walked into an interview and left the room humming with theories.

The Stranger Things alum confirmed she’s stepping into the Marvel playground for Spider-Man: Brand New Day, but she wasn’t about to hand over the keys to her character. 'I can confirm I’m not Spider-Man. I’m not Aunt May either,' she said, with a smile that only helped fan speculation. Short. Sharp. Teasing.

That kind of tease is a gift to rumor mills. Fans immediately floated familiar names — Gwen Stacy, even Jean Grey — though some ideas feel more wishful than canonical. The real answer? Marvel wants you to find out on the big screen.

Zendaya shares top billing, and the rest of the roster reads like a who’s-who: Jacob Batalon, Jon Bernthal, Tramell Tillman, Michael Mando and Mark Ruffalo all appear alongside Sink. Big names. Big expectations. The release date is set for July 31, 2026, and that single date suddenly looks very close.

Sadie Sink’s presence is confirmed — her character remains Marvel’s best-kept secret. Hold your theories. Buy your ticket. And see which of them sticks when Brand New Day opens in theaters.