For Sadie Sink, the internet didn’t just speculate about her next role — it broke the news to her first. The actress recently revealed that she learned she had been cast in Marvel’s upcoming film Spider-Man: Brand New Day through online fan theories before she officially received the offer. Sink shared the surprising story during an appearance on The Tonight Show Starring Jimmy Fallon, where she discussed the intense online speculation surrounding her Marvel debut. The actress will star alongside Tom Holland, who returns as the web-slinging superhero.
“It’s torture,” Sink said of the nonstop rumors. “There’s so much speculation. I feel like there’s a new character every week.”
Fan Theories That Hit Close to Home
Sink explained that the rumors began circulating even before she was officially cast. According to the actress, fans online were already convinced she would appear in the next Spider-Man film — long before Marvel made any announcements.
“I found out through online theories,” Sink told Fallon. “Before I got cast, there was speculation online that said, ‘Sadie Sink is gonna be in the new Spider-Man,’ and I was like, ‘I am?’”
Just days later, the speculation became reality. “Sure enough, two days later, they asked me to do it,” she added. “Those theories, there’s sometimes some truth to them.”
Since Sink is known for her red hair, fans have flooded social media with guesses about which Marvel character she might be playing. From classic comic book heroines to lesser-known figures, nearly every redheaded character in the Marvel universe has been suggested — though Marvel Studios has yet to confirm her role.
From Stranger Things to the Marvel Universe
Sink’s casting marks a major new chapter following the conclusion of Stranger Things, where she rose to global fame as Max Mayfield. With the Netflix series now wrapped, Sink’s transition into blockbuster films has drawn significant attention.
Marvel fans have reacted enthusiastically to her casting, with discussions spreading across Reddit, X, and other platforms. Some users noted that Holland himself previously shared a similar experience, discovering his Spider-Man casting through online chatter before it was officially announced. Others speculated whether studios sometimes allow rumors to circulate to gauge public reaction before finalizing deals — a theory that continues to spark debate among fans.
Internet Buzz Keeps Growing
Since Sink’s comments aired, online discussion has only intensified. Fans are dissecting every interview, red carpet appearance, and casting rumor for clues about her character’s identity and importance to the Spider-Man storyline.
While Marvel remains tight-lipped, Sink appears to be taking the attention in stride. Her candid admission underscores how deeply fan culture and social media have become intertwined with modern Hollywood casting — sometimes to the point where audiences learn the news before the actors themselves.
For now, Sink is enjoying the moment, even if the speculation can be overwhelming. And as Spider-Man: Brand New Day moves closer to release, one thing is certain: the internet will be watching — and theorizing — every step of the way.
