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.
Glee executive producer Brad Falchuk responded that while he understood the concern and frustration of disability advocates, Mc Hale had the singing and acting ability, talent and charisma required for the role.
A number of the principal actors were cast directly from Broadway, while those without theatrical backgrounds were required to demonstrate singing and dancing as well as acting ability.
In casting Glee, series creator Ryan Murphy sought out actors who could identify with the rush of starring in theatrical roles.
The initial main cast encompassed club director and Spanish (later History) teacher Will Schuester (Matthew Morrison), cheerleading coach Sue Sylvester (Jane Lynch), guidance counselor Emma Pillsbury (Jayma Mays), Will's wife Terri (Jessalyn Gilsig), and eight club members played by Dianna Agron, Chris Colfer, Kevin Mc Hale, Lea Michele, Cory Monteith, Amber Riley, Mark Salling and Jenna Ushkowitz.
For the second season, formerly recurring cast members Mike O'Malley, Heather Morris and Naya Rivera were promoted to the main cast.