As the saying goes, sometimes change is a good thing, and there's a whole lot of changing going on in this episode! 
The Glee club is distraught because Mercedes has left New Directions for the Troubletones, and she's recruited Santana and Brittany; btw their rendition of CandyMan is so Glee-tastic, Jenna admits she was a little jealous not to be a part of it. 
Meanwhile, new club, new relationship status for Brittany and Santana . . . they're officially dating! Idina is back with a new storyline, and Kevin and Jenna have mixed feelings about it. Sue has a new foe, and there's a new kid in town, Irish foreign exchange student Rory Flanagan, played by "Glee Project" co-winner Damian McGinty. He's got the voice of an angel, but not everyone is happy about that! Could they have packed more into one show?! See omnystudio.com/listener for privacy information.