In the face of much criticism, an optimistic high school teacher challenges a group of outcasts to realize their potential in the school's glee club.
Rachel begins school at NYADA, where she meets junior Brody Weston (Dean Geyer) and starts classes with a tough dance instructor, Cassandra July (Kate Hudson). At McKinley High, the rebuilding of New Directions begins and Wade "Unique" Adams (Alex Newell) transfers to join the group. Kurt aids director Will Schuester in finding potential recruits, who include Marley Rose (Melissa Benoist) and Puck's half brother Jake (Jacob Artist).
Brittany is depressed, and turns to her namesake Britney Spears for inspiration. Rachel continues to struggle in adjusting to life at NYADA and in New York, but gets help from new friend and classmate Brody. Puck meets Jake for the first time, when Will calls him.
Kurt gets an internship in New York at Vogue.com, working for Isabelle Wright (Sarah Jessica Parker). At McKinley High, Blaine runs against Brittany for president and wins. Rachel starts to warm up to her new classmate Brody inviting him to her and Kurt's apartment, but Finn shows up unexpectedly.
The relationships of four of the couples are tested – Will and Emma, Rachel and Finn, Kurt and Blaine, and Santana and Brittany but only one of them will survive.
The McKinley High production of "Grease" is being cast, and Artie recruits McKinley graduates Mercedes and Mike to help out with auditions. Competitors for the lead role of Danny include Jake and football player Ryder Lynn, while Marley and cheerleader Kitty are rivals for Sandy, the female lead. Will also has a big decision to make.
The McKinley High production of "Grease" opens, and Santana returns to help out. Rachel has another run-in with Cassandra, her dance instructor; and Kurt and Rachel visit Lima. Finn becomes the interim Glee Club Director.
As their trophy from winning Nationals is being stolen – the New Directions start to think of what superheroes would do. As a conclusion, this weeks assignment is "Dynamic Duets". Romantic tension builds between Marley and two of the glee club's males, Jake and Ryder. Blaine checks in on the Warblers.
It's time for sectionals, and New Directions receives guidance from some of the recent McKinley graduates who volunteer to mentor the glee club during their Thanksgiving break. Meanwhile, Rachel and Kurt have a non-traditional holiday dinner in the Big Apple.
Finn thinks about his future with the glee club after sectionals are over. Elsewhere, Rachel gets ready for NYADA's winter showcase; and Kurt gets a second chance at an audition.
A tribute to the film "Love, Actually" with five different storylines all dealing with the holidays. Sam and Brittany live as if it's the end of the world as the Mayans know it. The Puckermans, including half-brothers Puck and Jake and their mothers, come together for Chanukah. Artie suffers a head injury in which he slips on ice and has an epiphany through a dream sequence. He wonders what may have happened if he was never in a wheelchair and glee club never formed. His black-and-white vision has Rory as his guardian angel, reminding him of who he was to the glee club. Kurt spends Christmas with Blaine and his father in New York, whilst discovering his father has prostate cancer. Sue struggles to get a Secret Santa present for Marley's mother, Millie, but has a change of heart after seeing Marley and Millie struggle.
McKinley’s Sadie Hawkins dance offers several gleeks a rare chance to feel empowered. Sam and Blaine investigate a possible cheating scandal at sectionals. Kurt makes a new friend at NYADA.
New Directions produces a sexy calendar to raise money for their trip to Regionals. Rachel is faced with a personal dilemma when she’s cast in a student film. Finn and Sue go toe-to-toe.
Finn encourages the glee-club members to channel their inner divas. Elsewhere, Rachel's arrogance causes Kurt to reach a breaking point; and Emma throws herself into wedding preparations.
Will and Emma get ready for their Valentine's Day wedding with the help of past and present New Directions members.
The kids of New Directions go head-to-head in their annual boys vs. girls mash-up competition; this time using the music of the movies. Meanwhile in New York, Santana makes herself at home in the loft a little too quickly for Rachel and Kurt's comfort.
Open with the kids addressing the recent awkwardness between Will and Finn. And the two Glee leaders are given an assignment: the two must perform a song together using the theme of feuds. Blaine and Sue will have a sing-off, while Ryder has a scary story coming.
The New Directions tackle an assignment, meaning the songs as well as groups that everyone is too embarrassed to admit that they love.
The members of New Directions are prepping for regionals, but when an unthinkable event occurs at McKinley High, perspectives are put into order.
When Mr. Schuester comes up with the setlist for regionals, the New Directions are not pleased, Rachel sings an unexpected song for her "Funny Girl audition", and Marley writes an original song.
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 take on the greatest hits of music icon Stevie Wonder. Meanwhile, Artie receives news that could affect his future and his mom. In New York, Rachel prepares for her "Funny Girl" callback.
It's finally time for Regionals, and the glee club is more determined than ever to advance to Nationals. Brittany returns from her MIT trip with a new attitude and Ryder finally has a lead on who is "catfishing" him.