Hollywood’s casting rumor mill has been spinning faster than ever of late, especially as Marvel Studios quietly assembles its next wave of storylines. The studio’s most recent move, with Sadie Sink at the center, has signaled a clear shift toward fresh energy and new dynamics. With anticipation building once again around the superhero house, the question long echoing across Marvel enthusiasts’ circles has found new life: Who is the Stranger Things star playing in the fantasy-action realm?

Sink, who had one reported Marvel role until a few hours ago, now has two — and this latest development has made queries about her part in the MCU more pressing than ever.

Sadie Sink was reportedly cast in Spider-Man: Brand New Day back in March, but her role in the Tom Holland starrer is yet to be confirmed. People have speculated she could play the web-slinger’s love interest Mary Jane, Jean Grey, cosmic villain Shathra, Punisher ally Rachel Cole-Alves, or even Mayday Parker. Today, Deadline confirmed that Sink will reprise her Brand New Day role in Avengers: Secret Wars, slated for a 2027 release, yet the outlet once again offered no insight into who she is playing.

The last time buzz around Sadie Sink’s Marvel role took off was in late October, when she was spotted on the Spider-Man: Brand New Day set in Basingstoke. Sink’s look, however, remained hidden beneath a large jacket, preserving the growing ambiguity surrounding her character — both in the film and the larger Marvel universe. While Deadline revealed that she is part of Avengers: Secret Wars, there is also curiosity regarding the Avengers venture that will precede that movie.

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Will Sadie Sink also appear in Avengers: Doomsday, led by Robert Downey Jr. and scheduled to arrive only months after Spider-Man: Brand New Day?

While Deadline revealed that Sadie Sink will shoot Secret Wars in London in late 2026, it did not share any details about her involvement in Avengers: Doomsday. It could be that the masses see her first in Spider-Man 4 and then directly in Secret Wars, or she may continue her Marvel streak with an appearance in Doomsday. With the studio keeping everything under wraps, the question of how extensively Sink will feature in this next phase remains wide open.

As Marvel keeps its cards close, the mystery surrounding Sadie Sink’s MCU future only adds to the growing excitement. Her next on-screen chapter, though, arrives as early as next week with Stranger Things 5, setting the stage for a blockbuster year before her Marvel storyline even begins to unfold. Whether she swings into action, taps into cosmic power, or surprises her admirers with something entirely unexpected, Sink’s ascent across Hollywood’s biggest franchises is clearly just getting started.

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Who do you think Sadie Sink will play in the MCU? Let us know in the comments.