Will encourages the Glee Club to support Artie, and asks each of them to perform in a wheelchair. Meanwhile, Kurt and Rachel compete for a big solo.

Sectionals is finally here for the Glee Club, but when Quinn’s secret unravels, the club may not be able to recover in time to compete. Meanwhile, Sue’s scheming hits an all-time high, and with Emma and Ken’s marriage looming, Will makes a decision that could change his life forever.

When Mr. Schuester gets sick, a substitute teacher takes over his Spanish class and the glee club and winds up winning over the whole New Directions clan. Meanwhile, when Sue fills in for Principal Figgins as McKinley’s top dog, she tries to flex her power on campus.

Finn tries to rally the rival show-choirs behind one of their own; Sue’s bid for political office causes heartbreak for another teacher; and the student body elections turn scandalous.

To cause distension among the Glee Club members, Sue forces the students to compete against each other, but the real showdown happens when she and Will get called into the principal’s office. Meanwhile, the Glee kids rally to support Quinn after some shocking news is revealed.

While Kurt tries out for the football team (taking a page from the glee playbook with him), Rachel storms out of glee practice when Will gives a plum part to Tina. Meanwhile, Sue comes up with a new plot to boost her program at glee's expense; and Quinn has news for Finn.

The glee club pays homage to a true icon when they cover Whitney Houston's greatest hits. Meanwhile, Emma and Will are one step closer to their dream wedding.

The New Directions remember Finn.

It's Christmas time at McKinley High and Finn tries to get everyone in the holiday spirit; Brittany needs no help because she still believes in Santa Claus. In other news, Sue scams the teacher's Secret Santa

Inspired the by the students, Will composes a mash-up for a very special occasion. Meanwhile, in a shocking reversal of roles, McKinley High’s cool kids are dethroned in an “icy” fashion, and Sue shows off her softer side.

Mr. Schuester has the Glee Club split up into pairs to sing their favorite ballad, but when one kid gets sick, he’s forced to step in and winds up in a sticky situation. Meanwhile, Finn and Quinn have to face the music when dinner with her parents goes awry.

Will decides to have the glee club perform “The Rocky Horror Show” for the annual school musical after learning of Emma’s newfound love for the cult classic. Despite Sue’s usual scheming, the members of New Directions inject their distinctive style to such timeless tracks as “The Time Warp” and “Damn It, Janet.”

After Finn and Sam find an unconventional way of controlling their urges, a few glee club members pick up on the strategy and start using it too. But when Coach Beiste gets wind of what they are up to, the glee club has some explaining to do. Meanwhile, the Girls vs. Boys Tournament returns, Kurt meets an ally from a rival glee club, Puck and Artie join forces and coach Beast is on the verge of quitting her job.

New Directions continues to strategize their set list for Nationals with a little help from Jessie St. James. Meanwhile, an unexpected loss rocks the world of one of McKinley’s own.

When Will tries to plan a special surprise for Emma, he enlists the glee club to help him sweep her off her feet. Meanwhile, Becky sets her sights on Artie, and Finn makes an announcement about his life plans after high school that surprises the glee club.

Optimistic high school teacher Will Schuester tries to refuel his own passion while reinventing the McKinley High School’s glee club and challenging a group of outcasts to realize their star potential. Going up against McKinley’s cruel high school caste system and facing harsh criticism from everyone around him, Will is determined to prove them all wrong.

Will decides to give New Directions some competition between them by having the boys go against the girls. Terri becomes the school nurse to check on Will.

Holly Holiday returns as the sex education substitute teacher and helps the glee club out with some new numbers. On the other hand, Emma becomes the head of the celibacy club.

Santana helps Rachel do damage control for her flagging public image; Kurt tries to help a home for retired Broadway performers with their production of Peter Pan; to prove he is responsible, Sam adopts a dog - despite Mercedes’ objections.

It's all about wedding and parents with Kurt getting ready for his father Burt's upcoming marriage to Finn's mom Carole, Sue decides to compete by getting married as well which will lead to the introduction of an awesome guest star: Carol Burnett. Carol will play Sue's Nazi-hunting mother Doris, who comes to visit Sue in Ohio.

The glee club are saying goodbye to each other when two old guests come and decide to save the glee club.

Will thinks the glee club desperately needs more of an edge, so he brings in his former classmate, April Rhodes, to spice things up. Will’s plan seems to be going smoothly until he realizes he may be losing a key member of the club.

Mr. Schuester is concerned that the girls in the glee club are being disrespected and bullied by the guys. Looking to Madonna and her musical message of equality as inspiration, he challenges the entire team to choose Madonna songs as their next assignment in the hopes that the girls embrace her strength, independence and confidence and that the guys will see the error of their misogynistic ways. The glee club takes the assignment to heart as they perform some of Madonna’s greatest hits, including “Express Yourself” and “Like A Prayer.” Meanwhile, Kurt and Mercedes give Sue a vote of confidence with a makeover that is definitely in “Vogue”.

The school musical West Side Story is readied for performance, with Artie as lead director. Finn meets with a football recruiter, whom Coach Beiste gains as an admirer. Kurt and Blaine reach a new, physical stage in their relationship, as do Rachel and Finn in theirs.

Things heat up as the New Directions go head-to-head with the Dalton Academy Warblers at Regionals.