Glee is a musical comedy-drama television series that aired on Fox in the United States for six seasons from 2009 to 2015.
It focuses on the high school glee club New Directions competing on the show choir competition circuit, while its members deal with relationships, sexuality and social issues.
The fourth season began with fourteen in the main cast, with Chord Overstreet being promoted, and Mays and Agron were removed and demoted to recurring cast.
The fifth season saw the biggest change, with Monteith's death, and Morris, Riley, Salling and Shum all being switched to recurring status.
In season four, she transfers to Mc Kinley where she becomes a part of the New Directions.
She first appears in the third-season episode "Saturday Night Glee-ver" as a new featured singer in Vocal Adrenaline who is a fan of both Mercedes and Kurt despite being a competition rival.
Chris Colfer (Kurt Hummel) had originally auditioned to play Artie Abrams.
Although Colfer had no previous professional experience, Murphy was so impressed by Colfer's performance that the role of Kurt Hummel, named after the character Kurt from The Sound of Music, was created for him.
The series has many supporting characters, including faculty members, students and relatives of the glee club members.
Broadway stars including Idina Menzel, John Lloyd Young, Jonathan Groff, Phoebe Strole and Kristin Chenoweth have been featured in guest roles.