Jenna Ushkowitz, Heather Morris, Amber Riley, Lea Michele (back), Naya Rivera, Dianna Agron and Matthew Morrison Photo

From: Photo Flash: GLEE - New Episode Sneak Peek 'Vitamin D'

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.