The school gets ready for a production of "Grease."
Brittany falls into a depression, and ends up turning to the music of her idol Britney Spears. Rachel goes to her new friendBrody to help her impress her dance teacher.
It is Graduation day at McKinley High and bittersweet time for The New Directions.
The New Directions travel all the way to Chicago to compete in the 2012 Nationals. The Judges turn out to be celebrities Lindsay Lohan and Perez Hilton.
Brittany as class president begins to set up the senior prom; she settles on a Dinosaur theme for the evening; The hunt begins for the prom king and queen; troublemakers have their own plans for prom night.
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Blaine's older brother Cooper (guest star Matt Bomer), visits Lima and gives a class to the New Directions. The Glee Club does senior ditch day at Six Flags. Quinn's fate is revealed.
As New Directions gears up for sectionals, Sebastian tries to undermine their win. Karofsky makes a terrible decision and Sue proves she really can do anything.
New Directions are tasked with performing the great love songs of our time to celebrate Valentine's Day. Meanwhile, on news of Rachel and Finn's engagement, Rachel's two dads (played by Jeff Goldblum and Brian Stokes Mitchell), show up at McKinley High to congratulate the lovebirds.
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McKinley High's night school teacher comes on board to help Will with his latest singing assignment: music in Spanish. Guest star Ricky Martin joins New Directions for a Latin themed episode. Meanwhile, news of Rachel and Finn's engagement starts to spread, and Mercedes finds her in the middle of a complicated romantic relationship.
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While investigating the murder of a Navy Commander, the NCIS team finds out the whereabouts of Agent E.J. Barrett.
Finn tries to help Santana feel better about herself, while she faces the challenge of coming out to her family. Puck tries to seduce Shelby and Quinn tries to seduce him.Meanwhile, the voting for Senior Class President and the Congress seat occur, and Sue complicates Beiste's relationship.
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Sue starts a dirty campaign against Burt and the competition between New Directions and the Trouble Tones gets nasty.
Mercedes tries to convince Santana to join Shelby's all-girl glee club. Meanwhile, Brittany's family takes in Irish exchange student (The Glee Project's Damian McGinty).
Mike's future in New Directions is challenged after his parents ask him to drop out because he received an A- (the Asian F) on an exam. In other news, the auditions are heating up for the musical, West Side Story, and Will wonders why Emma doesn't want him to meet her parents who are in town visiting.
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New Directions faces a shake up when Shelby Corcoran (special guest star Idina Menzel) comes to McKinley High and Rachel has to deal with the return of her biological mother. Meanwhile, Kurt starts his run for class president with the special help of Brittany.
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The third season kicks off with Will assigning the glee clubbers a new project which will help them get back on track after losing at nationals last year. Sue sets off a new project as well: running for office in a congressional campaign with a focus on getting arts out of schools.
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