Styles, an accomplished British musician who got his start as a member of the band One Direction, has few acting credits: guest-starring as himself on an episode of Nickelodeon's "iCarly," playing a soldier in Christopher Nolan's "Dunkirk," and appearing as Eros in the end-credits scene of Marvel's "Eternals."
In "Don't Worry Darling," simulation Jack is charming and British. When the movie's plot twist is revealed, audiences learn that in the real world, he's a 29-year-old American who lives in a crappy apartment and listens to Frank's teachings on the computer while Alice, a surgeon, works lengthy shifts in a hospital.
Styles only briefly speaks in an American accent in the movie, during the flashbacks — which felt like an intentional way to disguise the budding actor's weak American accent.