Sadie Sink Opens Up About Her Secret ‘Spider-Man: Brand New Day’ Role

In Spider-Man: Brand New Day, Stranger Things alum Sadie Sink is making her mysterious Marvel debut, and it’s had fans buzzing since the first trailer dropped. Theories have been circulating across the World Wide Web about the identity of her character, ranging from Jean Grey, who would bridge a gap for the X-Men and the MCU ahead of Avengers: Doomsday, to Spider-Girl, Firestar, and Gwen Stacy. Now, as we creep closer to opening day on July 31st, Collider’s Steven Weintraub has had the chance to chat with Sink about her leap from one major pop cultural sensation to another.

After the heartbreaking events of Spider-Man: No Way Home, Peter Parker (Tom Holland) has had to watch everyone he loves move on with their lives without him. His noble sacrifice wiped any memory of Parker from the minds of even his best friend, Ned (Jacob Batalon), and MJ (Zendaya). To make matters worse, something has triggered a frightening mutation in him, but this new transformation could be the key to stopping a powerful threat to the city that no one can see. Brand New Day also stars Jon Bernthal as Frank Castle/Punisher and Mark Ruffalo as Bruce Banner/The Hulk.

During their conversation, Sink revisits her time on Stranger Things, comparing the secrecy of Season 5 to this new Marvel-level of confidentiality, but shares what she knew from the jump. She talks about when she first learned about the role, working with director Destin Daniel Cretton on the character, and when she finally had a good sense of what she’d be doing in Brand New Day. She also addresses fan theories, avoiding any Holland-style press slip-ups, and more. You can watch the full interview in the video above or read the transcript below.

Sadie Sink Compares Working on ‘Spider-Man: Brand New Day’ to ‘Stranger Things’

Sink starred in 4 seasons of the hit Netflix series.

COLLIDER: I’m so happy for you that you can finally start talking about the movie, but you’re not really talking about the movie.

SADIE SINK: I’m not really talking about much. [Laughs]

How would you compare the secrecy of Spider-Man to your time on Stranger Things? Is it even more intense?

SINK: At this point, it is even more intense. Last season was hard with the coma of it all. I couldn’t really say much about Max’s fate, so that was kind of hard to keep a secret. But this, I can’t even say who I’m playing, which is pretty extreme.

Tom has a famous history of accidentally revealing spoilers. Was there a time that he told you something you should not have known?

SINK: No, I don’t think so. But he definitely told me stories of him, I guess, giving away some spoilers, and warned me not to do that.

He does have a history of that. I’m sure you have a family member or a friend that you needed to tell information to because you couldn’t just keep it bottled up. Which family member or friend ended up being the one you spilled to?

SINK: Well, the castmate that I lived with during Season 5 of Stranger Things, she was kind of around for all of it, so she might have been the first person that I told because I had to tell someone, and we lived together. And then a little bit of family here and there, but that’s kind of it. In the beginning, I was really terrified to say anything.

Sadie Sink on the “Sheer Volume” of Fan Theories About Her Secret ‘Spider-Man: Brand New Day’ Character

“There was a new character every day.”

Image via Sony Pictures / Marvel Studios

I’m sure you’ve looked at fan theories online. Is there one that has really amused you?

SINK: There’s not one specific one that’s amused me. I think it’s just like the sheer volume of theories that were kind of coming in every week. That was funny just because there was a new character every day, it seemed.

Have you seen the movie yet?

SINK: I have, yes.

I’m sure going in, you had an idea of what you were making. How did the finished film compare to what you thought it would be while you were making it?

SINK: Weirdly, I think it was exactly what I thought it would be, which doesn’t always happen. But for this, it felt like everything that we thought we were making on set, like the tone, all really translated beautifully, I thought.

But the one thing that is always going to be different is the visual effects component, because stuff that’s not there ends up being there in the final cut, so that’s always fun to see.

Marvel Fans Knew About Sadie Sink’s ‘Spider-Man: Brand New Day’ Casting Before She Did

“I don’t know where they got this information.”

Image via Sony Pictures / Marvel Studios

I read that you read online that you were one of the people possibly going to be in Spider-Man: Brand New Day, and then it was two days later that you actually got a phone call. What the hell was this like for you? What was it like reading the script for the first time?

SINK: The casting was so bizarre because I did see the fan theories online saying that I had a role in the new Spider-Man movie. You see those every once in a while, and you’re like, “I don’t know where they got this information.” But then they actually did call a couple of days later, which was just wild to go from reading something to it actually being a possibility.

Then I had to wait a long time until I finally got to read the script. Obviously, I knew about the character and everything and had spoken to Destin [Daniel Cretton] about it, but it wasn’t until I got to London that I finally got to read it and get a better sense of what I’d be doing.

I don’t actually know the specifics of the arc, but when you got cast, how much were you told about, “This is what we think could be your character?”

SINK: They were pretty transparent with me. I had a good sense of what I’d be doing.

Spider-Man: Brand New Day swings into theaters on July 31.

Advertisement

Release Date

Advertisement

July 31, 2026

Runtime

150 Minutes

Advertisement

Director

Destin Daniel Cretton

Advertisement

Advertisement

Advertisement