Brittany and Santana plan their wedding. The Gleeks weekly assignment is the music of Burt Bacharach, and reigning diva Mercedes is recruited to act as a mentor for the new singers. Brittany learns a shocking family secret.

All of Will’s hard work and dedication to the Glee Club and to fostering the talents and dreams of his students pays off in a major way, and everyone shares in the feeling of joy that permeates the school as teachers and students reflect on their shared journey. Old rifts and wounds are healed and new sights are set on a promising future. Everyone seems to be ending up exactly as expected and right where they belong… along with more than a few unexpected surprises.

After Rachel's humiliating failure as TV actress, she comes home to Lima to figure out what she wants to do next. Upon discovering that Sue has banished the arts at McKinley, Rachel takes it upon herself to reinstate and lead the Glee Club. Meanwhile, Blaine, no longer in a relationship with Kurt, has moved home to coach the Warblers while Will is coaching rival Vocal Adrenaline, and Sam is the assistant coach for the McKinley football team.

Dalton Academy burns to the ground, and the Warblers must combine with the New Directions to form a super group. Meanwhile, Rachel begs Carmen Tibideaux to let her return to NYADA.

GLEE goes back in time to see why the original members of New Directions signed up for glee club in the first place.

Rachel and Kurt struggle as they try to rebuild and co-direct the glee club at McKinley. Meanwhile, Sue is concerned when Becky brings her new boyfriend to town.

The glee club learns the dance of the hour: twerking. Meanwhile, Marley discovers Jake's relationship with Bree, and Rachel tries to convince Kurt they both should get tattoos.

Puck, Quinn, Santana, Mercedes, Brittany, Artie and Tina all return to McKinley for Homecoming and help Rachel and Kurt recruit for the new glee club.

Rachel hopes to form a deal in which Will's glee club purposefully under-performs at their invitational; Sue wants Sam to distract Rachel.

Rachel and Kurt redouble their efforts to recruit new members to New Directions after new rules are announced for the Show Choir Invitational. Sue enacts an elaborate plan to try reunite Kurt and Blaine. Will and Rachel have a much needed heart-to-heart.

The members of New Directions must come together to prepare for their first public performance at a high-strung tween's bar mitzvah.

New Directions and the Warblers go head-to-head at sectionals. Meanwhile, Rachel must choose between returning to NYADA and doing another Broadway show with her past love, Jesse St. James.

When Brittany and the gang try to convince Mr. Schuester to let them do a Britney Spears number, he is reluctant to go that edgy. Meanwhile, an insecure Will is curious about Emma’s new beau, Dr. Carl Howell, so he convinces her to bring him in to talk to the kids about dental hygiene. While the dreamy doc inspires the girls to take their dental health more seriously, Will is left feeling worse than before.

Much to Blaine's chagrin, his big-shot Hollywood actor brother, Cooper, comes to visit.

Sue Sylvester introduces the episode as a Christmas special that FOX did not allow to air from last year. The members of New Directions audition for roles in McKinley's living Nativity Scene. Meanwhile in New York, Rachel, Kurt and Santana work as Santa's elves at a mall.

When the Glee Club is left out of the yearbook because of budget cuts, everyone seems to be relieved that they won’t have to suffer the ridicule of years past. Everyone except Rachel, that is, who wants her legacy cemented in print. Meanwhile, Quinn makes it her mission to be in the Cheerios yearbook photo, and Will and Terri’s relationship is shaken to its core.

The glee club agrees to help raise funds for another under-the-radar group; big decisions are made and relationships are tested.

When the power goes out at McKinley High, Will and Finn enlist the members of New Directions to "unplug" and perform acoustic numbers. Meanwhile, Isabelle Wright asks Kurt to volunteer at the Vogue.com charity event, with Rachel and Santana in tow.

The members of New Directions tackle their assignment of getting out of their comfort zones and determining whether they're more like "Katy" (Perry) or (Lady) "Gaga." Kurt holds auditions for his new band and must decide if he'll let in the overly bold performer, Starchild. Meanwhile, Jake gets closer to Bree as he and Marley grow apart.

Rachel is presented with a unique opportunity which could either take her career to the next level, or possibly kill it entirely. Meanwhile, Mercedes asks for Santana’s help finding a “new sound” for her latest single, and a wealthy New York socialite takes Blaine under her wing.

The glee club gets some news that’s sure to rattle a few nerves. Meanwhile, Quinn connects with her “funky” side with a little help from Mercedes, and Will gets revenge on Sue.

New Directions heads to the big Sectionals competition to go head-to-head against the Warblers and the Hipsters. While trouble brews between some of the young couples, Emma and Carl grow closer.

Rachel tries to launch a comeback into the McKinley High social stratosphere with a little help from Brittany. Meanwhile, Sam starts a tribute band.

The glee kids are down in the dumps following their disappointing showing at Nationals, so Will assigns them a project to get them back on track. Meanwhile, Ms. Sylvester wants to go to Washington: Sue's running for Congress.

Brittany goes into high gear as class president to spearhead the prom. Then, after prom king and queen nominations are announced, the kids kick into campaign mode, and some of the outcasts organize a rival celebration.