The film also stars Amy Adams, Rooney Mara, Olivia Wilde, and Chris Pratt. The film follows Theodore Twombly ( Joaquin Phoenix), a man who develops a relationship with Samantha ( Scarlett Johansson), an artificially intelligent virtual assistant personified through a female voice. It marks Jonze's solo screenwriting debut. Her (stylized in lowercase) is a 2013 American science-fiction romantic drama film written, directed, and co-produced by Spike Jonze.