Part one of two. It's the musical drama's 100th episode, and in light of last week's bad news, glee club members past and present reunite to bid farewell the only way they know how - by singing their favourite songs. But it's not all fun, as Rachel and Mercedes reignite their high-school feud, Puck tries to win back Quinn and Brittany worries that her academic work has made her less creative. guest stars Kristin Chenoweth and Gwyneth Paltrow (pictured) also come up with a scheme. . . .

Part one of two. It's the musical drama's 100th episode, and in light of last week's bad news, glee club members past and present reunite to bid farewell the only way they know how - by singing their favourite songs. But it's not all fun, as Rachel and Mercedes reignite their high-school feud, Puck tries to win back Quinn and Brittany worries that her academic work has made her less creative. guest stars Kristin Chenoweth and Gwyneth Paltrow (pictured) also come up with a scheme. . . .