he fourth season of the Fox musical comedy-drama television series Glee was commissioned on April 9, 2012. It premiered on September 13, 2012 and is produced by 20th Century Fox Television, Ryan Murphy Television and Brad Falchuk Teley-Vision with executive producers Dante Di Loreto and series co-creators Ryan Murphy, Brad Falchuk and Ian Brennan.
The series features the New Directions glee club at the fictional William McKinley High School in the town of Lima, Ohio. The fourth season continues in Lima with a new generation of students but will also follow some of the McKinley graduates from the third season, notably to the fictional New York Academy of the Dramatic Arts in New York City. The season follows the club through a loss on a technicality at the sectional competition and subsequent reinstatement before winning at the regionals, advancing them to their third consecutive national show choir competition. Throughout the season, the club and its alumni deal with sex, relationships, bulimia, gender identity, child molestation, dyslexia, infidelity, school violence, pregnancy scares and other social issues. As of the season premiere, fourteen main cast members are retaining that status from the third season: glee club director Will Schuester, cheerleading coach Sue Sylvester, glee club members Artie Abrams, Blaine Anderson, Tina Cohen-Chang, and Brittany Pierce, and graduates Rachel Berry, Mike Chang, Finn Hudson, Kurt Hummel, Mercedes Jones, Santana Lopez and Noah "Puck" Puckerman. Previously recurring character Sam Evans, a glee club member, has been promoted to the main cast in the fourth season.Overview from themoviedb.org