Glee is an American musical comedy-drama television series that aired on the Fox network in the United States from May 19, 2009, to March 20, 2015. It focuses on the fictitious William McKinley High School glee club, the New Directions, which competes on the show choir competition circuit while its disparate members deal with social issues, especially regarding sexuality, race, relationships, and teamwork. The initial twelve-member cast included Matthew Morrison as club director and Spanish teacher Will Schuester, Jane Lynch as cheerleading coach Sue Sylvester, Jayma Mays as guidance counselor Emma Pillsbury, Jessalyn Gilsig as Will's wife Terri, and Dianna Agron, Chris Colfer, Kevin McHale, Lea Michele, Cory Monteith, Amber Riley, Mark Salling, and Jenna Ushkowitz as eight club members. The main cast was altered throughout the series.