Wyatt Jess Oleff is an American actor, known for portraying the role of Stanley Uris in the 2017 supernatural horror film It and its 2019 sequel, as well as the role of Stanley Barber in the coming-of-age comedy-drama Netflix series I Am Not Okay With This (2020), and a young Peter Quill in the Marvel Studios superhero films Guardians of the Galaxy (2014) and Guardians of the Galaxy Vol. 2 (2017).

It is a 2017 American supernatural horror film directed by Andy Muschietti and written by Chase Palmer, Cary Fukunaga, and Gary Dauberman. It is the first of a two-part adaptation of the 1986 novel of the same name by Stephen King, primarily covering the first chronological half of the book. It is the first film in the It film series as well as being the second adaptation following Tommy Lee Wallace's 1990 miniseries. The film stars Jaeden Lieberher and Bill Skarsgård as the lead roles, with Jeremy Ray Taylor, Sophia Lillis, Finn Wolfhard, Wyatt Oleff, Chosen Jacobs, Jack Dylan Grazer, Nicholas Hamilton, and Jackson Robert Scott featured in supporting roles. The film was produced by New Line Cinema, KatzSmith Productions, Lin Pictures, and Vertigo Entertainment. Set in Derry, Maine, the film tells the story of The Losers' Club, a group of seven outcast children who are terrorized by the eponymous being which emerges from the sewer (Skarsgård), only to face their own personal demons in the process.