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.

As McKinley High School's glee club begins new routines, a restriction forces them to make some choices. Will must decide whether to continue with his passion or provide for his wife, which ultimately brings him closer to Emma. As some members of New Directions grow closer romantically, other's intentions aren't supportive of the group.

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.

When Kurt sets his dad, Burt, up with an unexpected partner his plan for a nuclear family may backfire. Sue demands that the Cheerios! go on a crazy diet in preparation for a big interview with “Splits” magazine and April Rhodes returns to save Will and the glee club.

Mr. Schuester encourages the glee club to express themselves using the music of Lady Gaga. Meanwhile, Rachael has a life-changing encounter, and Tina embraces her inner Goth.

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.

The moment New Directions has been waiting for has finally arrived: it’s time for Regionals! But when Sue pulls a fast one on Will and the glee clubbers, their chances at the title could be compromised. Meanwhile, Quinn’s life changes forever.

Finn has an existential crisis when he believes he sees the face of Jesus in his grilled cheese sandwich. Meanwhile, the rest of the kids rally around Kurt after he has a crisis of his own that leads to a larger discussion among the group about their own theology.

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.

A local football championship game takes place and the "Thriller" mash-up is performed during the halftime show. The Cheerios, McKinley High's cheerleading team, compete at Regionals.

Irish exchange student Rory Flanagan arrives at McKinley High. He is living at Brittany's house, and she thinks he's a leprechaun. Mercedes starts recruiting for Shelby's new glee club, and Sue's run for congress picks up steam.

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.

In honor of Valentine's Day, Will challenges the New Directions to find and perform the world's greatest love songs. Meanwhile, Rachel's two dads Hiram and LeRoy Berry pay a visit to McKinley High.

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

The William McKinley High School class of 2012 graduates, and the glee club bids farewell to its graduating seniors.

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.

The New Directions remember Finn.

The glee club -- and two special guests -- travels to Los Angeles to compete in nationals.

The members of New Directions are busy at work planning, planning and planning, while Sue encourages everyone to follow their hearts.

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.