Sadie Sink’s next chapter after Spider-Man: Brand New Day: inside the projects coming next

Sadie Sink is not just dipping a toe into Marvel. She is stacking a slate that swings from MCU- scale mayhem to FX/A24 prestige and a play she is dragging from the stage to the screen herself. It is a career jump that looks calculated and, honestly, kind of unpredictable in a good way.

• Spider- Man: Brand New Day ( MCU) — Third billing with Tom Holland and Zendaya; Marvel will not say who she is playing. Reports say she did not formally audition and only got the script after landing in London. Teaser footage teases mind-control vibes and an antagonist you cannot see. Fan theory: Jean Grey. Sink has not confirmed anything, beyond noting that hair color changes. Role looks built to continue past one film. Filming is done; in theaters July 31, 2026.
• Avengers: Secret Wars (MCU) — Reportedly on board for December 2027, in a part tied directly to her Spider-Man character. Described as substantial, not a blink-and-miss cameo, plugging her mutant-adjacent thread into the Multiverse Saga. Ensemble includes Tom Holland and Mark Ruffalo.
• The Marriage Plot (FX/Hulu) — Limited series based on Jeffrey Eugenides' novel. Sink is starring and executive producing. Will Arbery (a writer on Succession) is adapting; Hiro Murai (Atlanta) is directing; A24 is behind it. It is her first major TV lead since Stranger Things, centered on love, identity, and a messy triangle.
• John Proctor Is the Villain (film) — She is producing and starring, reprising Shelby Holcomb from the Broadway run that earned her a Tony nomination for Best Actress. The play earned a reputation for sharp social commentary packed into a tight drama; moving it to film widens the audience without sanding off the edges.
• Theater — Recently played Juliet opposite Noah Jupe in London at the Harold Pinter Theatre. She called the run an 'exciting challenge' and has been clear the stage is still a priority, with plans to head back to New York and keep balancing theater with screen work.

Marvel first: the Spider-Man question mark

Marvel is playing the usual game of silence with Sink's role in Spider-Man: Brand New Day, which only cranks the rumor mill faster. The top-line placement — Tom Holland, Zendaya, then Sink — is not the kind of billing you give to a background character. Add in the behind-the-scenes detail that she reportedly skipped a formal audition and received the script on arrival in London, and it reads like a part Marvel handpicked and protected.

The footage so far leans into telepathic trickery and a 'you cannot see it' adversary. That, plus all the mutant chatter around the MCU, is why Jean Grey keeps popping up as the popular guess. Sink has not said yes or no — only that hair can be dyed, which is the diplomatic way of not answering the question without lying. Either way, the setup feels bigger than a one-and-done appearance.

Then the bigger swing: Secret Wars

She is reportedly attached to Avengers: Secret Wars in December 2027, and the chatter says her role connects directly back to Brand New Day. It is described as a real part, not a glorified post-credits wave, with her thread tying into the Multiverse Saga. Tom Holland and Mark Ruffalo are in that ensemble too, so the visibility is baked in. If the Jean Grey theory pans out, Secret Wars would be a neat on-ramp into whatever the MCU is planning for its full-on mutant era and the rumored X-Men reboot. For someone best known for intimate, character-first work, that is a serious franchise commitment.

Prestige lane: The Marriage Plot at FX and Hulu

On the TV side, Sink is headlining and executive producing The Marriage Plot, adapted from Jeffrey Eugenides' novel. Will Arbery is writing the series, Hiro Murai is directing, and A24 is backing — which is pretty much a calling card for prestige-level intent. It is a coming-of-age story with love, identity, and a tangled triangle at its center, and it is her first major television lead since Stranger Things wrapped. The EP credit suggests she is steering, not just starring.

From stage to screen: John Proctor Is the Villain

She is also producing and starring in the film version of John Proctor Is the Villain, carrying over her Shelby Holcomb from the Broadway run that got her a Tony nomination for Best Actress. The play drew praise for sharp, layered social commentary inside a tight, punchy drama. Putting it on film should let that material travel without losing the bite — another sign she is choosing substance alongside scale.

The stage is not a detour

In London, Sink just finished a West End run of Romeo and Juliet at the Harold Pinter Theatre with Noah Jupe. She framed it as both a stretch and a priority:

'An exciting challenge.'

The plan after that was to head back to New York, keep the theater muscle active, and avoid getting boxed in by one mega-role. It is a good counterweight to everything Marvel-sized lining up around her.

Where this all lands first

Her Spider-Man: Brand New Day work is already in the can, and the guessing about who she is playing is not slowing down before release. The movie hits theaters July 31, 2026.