View gallery Image Credit: Getty Images Sadie Sink has been booked and busy since wrapping Stranger Things, and MCU fans are convinced they know what character she's playing in Spider-Man: Brand New Day. The actress and Marvel Studios have remained tight-lipped about her role, but rumors about her casting pointed to a possible connection to the MCU's X-Men. During a January 2026 interview with Jimmy Fallon, Sadie said it's been "torture" hiding the details of her role.