Summary (tl;dr)

Musician Steve Lacy seemingly accidentally revealed that Sadie Sink's previously undisclosed character in the upcoming "Spider-Man: Brand New Day" film is "Jean," and that she is the villain, leading to widespread speculation that Sink is portraying the iconic X-Men character, Jean Grey.

Essential Background

For over a year, rumors have circulated that actress Sadie Sink, known for "Stranger Things," was cast in the new "Spider-Man: Brand New Day" movie, with strong speculation that she would play Jean Grey, a powerful telepathic mutant from the X-Men comics. Marvel Studios and Sony Pictures had maintained strict secrecy surrounding Sink's role, despite various clues like her being spotted in green and yellow on set and wearing green contacts. The movie "Spider-Man: Brand New Day" is the fourth Tom Holland-led Spider-Man film in the Marvel Cinematic Universe, picking up after the events of "Spider-Man: No Way Home," where Peter Parker's existence was forgotten by the world.

The Full Story

At the world premiere of "Spider-Man: Brand New Day" on July 27, 2026, musician Steve Lacy, whose song "oh yeah?" is featured on the film's soundtrack, inadvertently revealed a major spoiler regarding Sadie Sink's character. During a red carpet interview at the Dolby Theatre in Hollywood, when asked to name his favorite character without spoiling anything, Lacy replied, "Jean. I like Jean. She's the villain, but there's a reason to her madness. I like her. I like her character.". This comment, which quickly went viral, is being widely interpreted as confirmation that Sadie Sink is indeed playing Jean Grey, and that the character will serve as the antagonist in the upcoming Spider-Man movie.

Why It Matters

This accidental reveal is significant for several reasons. It seemingly confirms one of Marvel's most anticipated castings and potentially marks the official introduction of a prominent X-Men character, Jean Grey, into the Marvel Cinematic Universe through a Spider-Man film. Fans are particularly interested as it suggests "Brand New Day" could be a crucial bridge to Marvel's mutant era, especially with buzz about a formal X-Men casting reveal at the D23 Expo. The long-standing mystery surrounding Sink's role had fueled extensive fan theories and speculation, making this unexpected "spoiler" a major talking point and intensifying anticipation for the film's release on July 31.

Geographic Location

• Dolby Theatre, Hollywood, Los Angeles, Los Angeles County, California, United States (world premiere of "Spider-Man: Brand New Day" and accidental spoiler by Steve Lacy)