Sadie Sink has finally shared what it was like keeping one of Marvel Studios’ biggest casting secrets under wraps. Following the world premiere of Spider-Man: Brand New Day, the Stranger Things actress revealed that she spent more than a year protecting the identity of her character before the film officially reached audiences.
Speaking exclusively to PEOPLE, Sink admitted that staying silent wasn’t particularly difficult despite the enormous fan interest surrounding the project. Her comments offer a behind-the-scenes look at Marvel’s famously secretive production process, which often requires actors to keep major plot details hidden until release.
The secrecy surrounding Sink’s role sparked months of online speculation, making her one of the most talked-about additions to the Marvel Cinematic Universe before audiences finally discovered who she was playing.
Sadie Sink Says Only Her Closest Circle Knew the Truth
During her interview with PEOPLE, Sink explained that she had little trouble keeping Marvel’s secret because she naturally avoids revealing confidential information.
“I’m kind of a vault, so it wasn’t that hard.”
She added that joining the Marvel Cinematic Universe was exciting enough that keeping the mystery intact never felt like a burden.
“I was mostly just so excited to join this universe. So I was fine with keeping a secret for a year and a half or however long it’s been.”
While the public remained in the dark, Sink admitted that a small number of people were aware of her role.
“My family knew, my friends, close friends knew, but yeah, just not the press.”
Her comments highlight the balance Marvel actors often maintain between protecting major reveals and sharing career milestones with those closest to them.
Long before Spider-Man: Brand New Day premiered, Marvel fans spent months trying to identify Sink’s mystery character. Social media discussions suggested she could be portraying Gwen Stacy, Jean Grey, Rachel Summers, or even Mayday Parker, with each theory generating widespread debate across fan communities.
Sink acknowledged that people occasionally guessed her role directly, though she avoided confirming anything.
“Yes, that has happened… But that happens all the time online.”
Marvel also leaned into the speculation during the promotional campaign. Sink appeared only briefly in trailers, while a playful promotional video joked that she could confirm only that she wasn’t playing Spider-Man or Aunt May, keeping audiences guessing until release.
Beyond the secrecy, Sink described joining the MCU as one of the most enjoyable experiences of her career. She credited the cast for creating a welcoming environment while allowing her to develop an entirely new character.
Speaking with PEOPLE, she said:
“It was so much fun exploring a new character and especially doing that amongst people who are so supportive and welcoming as this cast was. It was really fun to stretch new muscles as an actor and just have some fun with it. It’s a fun movie.”
The film reunites Tom Holland as Peter Parker while introducing new characters and storylines that continue the franchise following the events of Spider-Man: No Way Home. Directed by Destin Daniel Cretton, Spider-Man: Brand New Day marks another major step in Sony Pictures and Marvel Studios’ ongoing collaboration and opens a fresh chapter for Spider-Man’s future on the big screen.
| Release Date | July 30, 2022 |
|---|---|
| Studio | Marvel Studios |
| Director | Jon Watts |
| Writer(s) | Chris McKenna, David James Kaiser |
