Actress Sadie Sink has revealed that only a small group of family and friends know her secret role in "Spider-Man: Brand New Day" [1].

Maintaining secrecy is a central part of the marketing strategy for the Marvel franchise. By teasing the mystery of her character while confirming a limited circle of confidants, Sink generates anticipation for the film's plot without risking a major leak.

In a video interview with Access Hollywood, Sink specified who has been told the secret [1]. "I told my mom, my best friend, and my sister, they’re the only ones who know," Sink said [1].

Sink, who is 24 [1], has worked closely with director Destin Daniel Cretton and co-stars Zendaya and Tom Holland to keep the character's identity under wraps [1]. Regarding her collaboration with the director, Sink said, "He was very transparent with me. He kind of told me everything" [2].

While the actress has not revealed the specific role, she did address one common theory regarding her character [3]. "I am not Aunt May," Sink said [3].

The actress used the interview to promote the film's release, which was scheduled for July 31, 2026 [1]. The promotional push aimed to build buzz around the "Brand New Day" storyline while the production team ensured the narrative surprises remained intact through strict non-disclosure practices.

Sink's approach to the role reflects the high-pressure environment of modern blockbuster filmmaking. The use of a tight inner circle allows the actor to balance the personal excitement of the project with the professional requirements of a studio-mandated secret [1, 4].

“"I told my mom, my best friend, and my sister, they’re the only ones who know."”

The strict control of information surrounding Sadie Sink's role highlights the 'spoiler culture' that dominates current franchise cinema. By selectively leaking that she is not playing a specific character like Aunt May, the studio directs fan speculation toward other possibilities, effectively using the actress as a tool for organic social media engagement while protecting the actual plot twist.