Ahead of the release of the newest film in the Marvel Cinematic Universe, Eternals, fans are learning the pop star is a surprise addition to the franchise. When the movie premiered at the El Capitan Theatre, attendees revealed that Styles pops up as Eros, Thanos' brother. "Big reveal from #TheEternals premiere," Variety Senior Film Writer Matt Donnelly tweeted. "Harry Styles has joined the MCU as Eros, brother of Thanos." According to the Los Angeles Times, fans will have to wait until after the movie is over to see Styles' debut as Eros because his appearance comes in a post-credits scene. While it's unclear exactly when Styles will return to the silver screen as Eros in a larger capacity, the Grammy winner is slated to return to theaters in Olivia Wilde's Don't Worry Darling, due out in 2022. Eternals, directed by Chloé Zhao, also stars Gemma Chan, Kumail Nanjiani, Salma Hayek and Angelina Jolie among others. The film is due to hit theaters in the United States in November.