The first season of the musical comedy-drama television series Glee originally aired on Fox in the United States. The pilot episode was broadcast as an advanced preview of the series on May 19, 2009, with the remainder of the season airing between September 9, 2009 and June 8, 2010. The season consisted of 22 episodes; the first 13 aired on Wednesdays at 9 pm and the final 9 aired on Tuesdays at 9 pm. The season was executive produced by Ryan Murphy, Brad Falchuk, and Dante Di Loreto; Murphy's production company helped co-produce the series alongside 20th Century Fox.
The show features the fictional high school show choir New Directions competing for the first time on the show choir circuit, winning at sectionals and losing at regionals, while its members and faculty deal with sex, relationships, homosexuality, teenage pregnancy, disabilities, acceptance and other social issues. The central characters are glee club director Will Schuester, cheerleading coach Sue Sylvester, Will's wife Terri, guidance counselor Emma Pillsbury, and glee club members Rachel, Finn, Artie, Kurt, Mercedes, Tina, Puck, and Quinn.