STAGE TUBE: First Look at Idina Menzel's Return to GLEE!

Tony Award winner Idina Menzel has been a recurring guest star on GLEE, returning tonight to the hit series, and we have a sneak peek of the Broadway veteran in action in 'I Am Unicorn.' Click below to find out why 'Shelby' makes a return to McKinley High!

GLEE, the genre-defying new musical comedy series, follows an optimistic teacher who - against all odds and a malicious cheerleading coach - attempts to save McKinley High's Glee Club from obscurity while helping a group of aspiring underdogs realize their true star potential. Starring Dianna Agron, Chris Colfer, Jessalyn Gilsig, Jane Lynch, Jayma Mays, Kevin McHale, Lea Michele, Cory Monteith, Matthew Morrison, Amber Riley, Mark Salling and Jenna Ushkowitz, GLEE is produced by Ryan Murphy Television in association with 20th Century Fox Television. Ryan Murphy, Brad Falchuk and Ian Brennan are co-creators of the series. Murphy, Falchuk and Dante di Loreto serve as executive producers, while Ian Brennan serves as co-executive producer.

The series airs on FOX on Tuesdays - including tonight, when Menzel makes her return to the series as Rachel (Lea Michele)'s mother Shelby.