Glee Season 2 Episode 20 : Prom Queen
As the race for prom queen heats up, Principal Figgins recruits New Directions to perform at the prom. Mercedes is distressed because she doesn't have a prom date, and Rachel arranges for Sam to take the two of them as a group. Jesse St. James (Jonathan Groff) returns to woo Rachel, which angers Finn. Kurt attempts to help Karofsky deal with his sexuality, and takes Blaine as his date to the prom. A surprising pair wins Prom King and Queen, with dramatic repercussions.