Plot: Former glee club star Will Schuester (Matthew Morrison) takes over McKinley High School's glee club in the hopes of restoring it to its former glory. He is faced with the challenge of converting a group of misfits, including fame-hungry Rachel Berry (Lea Michele), star quarterback Finn Hudson (Cory Monteith), outspoken Mercedes Jones (Amber Riley), flamboyant Kurt Hummel (Chris Colfer), stuttering goth Tina Cohen-Chang (Jenna Ushkowitz), and paraplegic Artie Abrams (Kevin McHale), into a team of good singers. Meanwhile, Will's pregnant wife Terri (Jessalyn Gilsig) pushes Will to find a higher paying job to support his family.

Singles: "On My Own" (Rachel), "Can't Fight This Feeling" (Finn), "Rehab" (Vocal Adrenaline), "Leaving on a Jet Plane" (Will), "Don't Stop Believin'" (Rachel & Finn with New Directions)

Plot: In an attempt to recruit new members, Will (Matthew Morrison) has the New Directions perform a disco number in front of the school for the first time, but the club has other ideas on how to attract new members. Will takes a second job as a janitor and grows closer to Emma (Jayma Mays), the school guidance counselor suffering from OCD. Sue Sylvester, the antagonistic cheerleading coach sends Finn's (Cory Monteith) girlfriend and head cheerleader Quinn Fabray (Dianna Agron) to join New Directions in order to help bring down the club. Meanwhile, Terri (Jessalyn Gilsig) discovers alarming news about her pregnancy.

Singles: "Gold Digger" (Will, Mercedes, and Artie with New Directions), "Push It" (New Directions), "I Say a Little Prayer" (Quinn with Santana and Brittany), "Take a Bow" (Rachel with Mercedes and Tina)

Plot: Will (Matthew Morrison) forms an all-male a cappella group called the "Acafellas," neglecting the glee club in favor of dedicating his time to the new endeavor. In his absence, the club members struggle with choreography, and resist attempts at sabotage by members of the cheer squad. Meanwhile, Mercedes (Amber Riley) harbors romantic feelings for Kurt (Chris Colfer), and Rachel (Lea Michele) and Finn (Cory Monteith) grow closer, despite his relationship with co-member Quinn (Dianna Agron).

Singles: "Mercy" (Vocal Adrenaline), "This Is How We Do It" (Acafellas), "Bust Your Windows" (Mercedes with Cheerios), "I Wanna Sex You Up" (Acafellas)

Plot: In an attempt to hide his homosexuality from his father, Kurt (Chris Colfer) joins the football team. Finn (Cory Monteith) asks Will (Matthew Morrison) to teach the football team to dance, hoping to improve their performance on the field. Sue (Jane Lynch) goes ahead with her plans to destroy the glee club by luring away their star performer Rachel Berry (Lea Michele). Meanwhile, Quinn (Dianna Agron) reveals to Finn that she is pregnant, but neglects to tell him one important thing about her baby.

Singles: "Taking Chances" (Rachel)

Plot: Will (Matthew Morrison), trying to find a twelfth member in the wake of Rachel's (Lea Michele) defection to the school musical, recruits former glee club star April Rhodes (guest star Kristin Chenoweth). Finn (Cory Monteith) flirts with Rachel continuously in an attempt to convince her to return, hoping that having her in the club will increase his chances of gaining a music scholarship. Meanwhile, the glee club performs at Invitationals, launching themselves onto the show choir competition circuit.

Singles: "Maybe This Time" (April & Rachel), "Alone" (April & Will), "Last Name" (April with New Directions), "Somebody to Love" (Finn, Rachel, Artie, and Mercedes with New Directions)

Plot: Believing the glee club members are becoming complacent ahead of Sectionals, Will (Matthew Morrison) pits the girls against the boys for a mash-up competition. Terri (Jessalyn Gilsig) takes a job as the school nurse to prevent Will (Matthew Morrison) from becoming closer to Emma (Jayma Mays). Meanwhile, Quinn (Dianna Agron) agrees to let Terri secretly adopt her baby, enabling her to continue faking her pregnancy.

Singles: "It's My Life/Confessions, Part II" (Finn, Puck, and Artie with New Directions boys), "Halo/Walking on Sunshine" (Rachel and Mercedes with New Directions girls)

Plot: Now acting as co-captain of the New Directions, Sue (Jane Lynch) attempts to tear the club apart by turning the students against each other. Meanwhile, Terri (Jessalyn Gilsig) blackmails her obstetrician into faking a sonogram, and Quinn (Dianna Agron) faces hardship when her pregnancy is revealed to the whole school.

Singles: "Hate on Me" (Mercedes with Sue's group), "No Air" (Rachel and Finn with Will's group), "You Keep Me Hangin' On" (Quinn with Cheerios), "Keep Holding On" (Rachel & Finn with New Directions), "Ride wit Me" (New Directions)

Absent: Jayma Mays

Plot: Driven by his jealousy of Will (Matthew Morrison) and Emma's (Jayma Mays) budding relationship, Ken (recurring guest star Patrick Gallagher) gives Finn (Cory Monteith), Puck (Mark Saling), Mike (recurring guest star Harry Shum Jr.) and Matt (recurring guest star Dijon Talton) an ultimatum; To choose between the glee club, or the football team. In an attempt to move on from Finn and Quinn (Dianna Agron) respectively, Rachel (Lea Michele) and Puck start dating. Sue (Jane Lynch) on the other hand, finds herself attracted to local news anchor Rod Remington (guest star Bill A. Jones). Meanwhile, Will prepares a mash-up song for Ken and Emma's wedding.

Singles: "Bust a Move" (Will with New Directions), "Thong Song" (Will), "Sweet Caroline" (Puck), "I Could Have Danced All Night" (Emma)

Absent: Jessalyn Gilsig

Plot: The glee club holds a bake sale to raise money for a wheelchair-accessible bus, so that paraplegic club member Artie (Kevin McHale) can travel with them to Sectionals. Quinn (Dianna Agron) struggles with the medical expenses incurred by her pregnancy, and Puck (Mark Salling) offers to support her. Sue (Jane Lynch) accepts a student with Down syndrome onto the cheerleading squad and pays the school to build new wheelchair ramps, leading Will (Matthew Morrison) to question her motives. Meanwhile, Kurt (Chris Colfer) and Rachel (Lea Michele) compete for a solo performance, and Artie and Tina (Jenna Ushkowitz) go on a date.

Singles: "Dancing with Myself" (Artie), "Defying Gravity" (Rachel & Kurt), "Proud Mary" (Mercedes, Artie, and Tina with Finn and New Directions)

Absent: Jessalyn Gilsig, Jayma Mays

Plot: When the glee club members split into pairs to sing ballads to one another, Rachel (Lea Michele) is paired with Will (Matthew Morrison) and develops a crush on him. Finn (Cory Monteith) and Quinn's (Dianna Agron) parents learn that Quinn is pregnant, leading to disastrous results. Meanwhile, Puck (Mark Salling) reveals to Mercedes (Amber Riley) that he is the father of Quinn's baby.

Singles: "Endless Love" (Will & Rachel), "I'll Stand By You" (Finn) "Don't Stand So Close to Me/Young Girl" (Will), "Crush" (Rachel), "(You're) Having My Baby" (Finn), "Lean on Me" (Artie & Mercedes with Tina and New Directions)

Absent: Jane Lynch

Plot: New Directions meets their Sectionals competition – Jane Addams Girls Choir for girls recently released from juvenile detention, and the Haverbrook Deaf Choir. To Terri's (Jessalyn Gilsig) horror, Quinn (Dianna Agron) reconsiders having her baby adopted, giving Puck (Mark Salling) a chance to prove that he would be a good father. Meanwhile, Kurt (Chris Colfer) gives Rachel (Lea Michele) a bad makeover, trying to sabotage her attempts at attracting Finn (Cory Monteith).

Singles: "Bootylicious" (Jane Addams Girls Choir), "Papa Don't Preach" (Quinn), "Hair/Crazy in Love" (Mercedes and Artie with New Directions), "Imagine" (Mercedes, Artie, Rachel, and Finn with Haverbrook School for Deaf and New Directions), "True Colors" (Tina with New Directions)

Plot: When the glee club is left out of the school yearbook, Rachel (Lea Michele) has the club members cast in a local mattress commercial in an attempt to raise their social status. The team is paid in mattresses, revoking its amateur status and rendering it ineligible to compete at Sectionals. Meanwhile, Will (Matthew Morrison) discovers that Terri (Jessalyn Gilsig) has been lying to him about being pregnant and is forced to make a decision whether to leave her or not, and Emma (Jayma Mays) and Ken (recurring guest star Patrick Gallagher) schedule their wedding on the same day as Sectionals.

Singles: "Smile" (Rachel & Finn), "Jump" (New Directions), "Smile" (New Directions)

Plot: The club faces problems when Finn (Cory Monteith) learns that Quinn's (Dianna Agron) baby is not his days before Sectionals. Sue (Jane Lynch) vows revenge when she is suspended by Principal Figgins (recurring guest star Iqbal Theba) over her attempts to sabotage the club. Meanwhile, Emma (Jayma Mays) and Ken's (recurring guest star Patrick Gallagher) wedding faces a hitch.

Singles: "And I Am Telling You I'm Not Going" (Mercedes), "Don't Rain on My Parade" (Rachel), "You Can't Always Get What You Want" (Rachel, Finn, Artie, and Mercedes with New Directions), "My Life Would Suck Without You" (Rachel, Finn, and Tina ( album ) with New Directions)

Plot: Blackmailing Figgins (recurring guest star Iqbal Theba), Sue (Jane Lynch) returns following her suspension, and enlists Santana (recurring guest star Naya Rivera) and Brittany (recurring guest star Heather Morris) to seduce Finn (Cory Monteith) and destroy his new relationship with Rachel (Lea Michele). In the meantime, Rachel catches the eye of Jesse St. James (recurring guest star Jonathan Groff), the lead singer of New Directions' rival, Vocal Adrenaline. Will(Matthew Morrison) and Emma (Jayma Mays) attempt to begin dating, but Emma's mysophobic behavior leads Will to make out with Vocal Adrenaline's coach, Shelby Corcoran (guest star Idina Menzel).

Singles: "Hello, I Love You" (Finn), "Gives You Hell" (Rachel with New Directions except Finn), "Hello" (Jesse & Rachel), "Highway to Hell" (Jesse with Vocal Adrenaline), "Hello, Goodbye" (Rachel and Finn with Mercedes and New Directions)

Plot: Inspired by the Cheerios and Sue (Jane Lynch) paying homage to Madonna, Will (Matthew Morrison) looks to the musical icon to nip the boys' recent misogynistic behavior in the bud. Emma (Jayma Mays), Rachel (Lea Michele), and Finn (Cory Monteith) weigh the pros and cons of losing their virginity. Jesse (recurring guest star Jonathan Groff) transfers to McKinley High and joins New Directions, despite the protest of Finn and others. In an attempt to get more opportunities to shine, Kurt (Chris Colfer) and Mercedes (Amber Riley) join the Cheerios.

Singles: "Express Yourself" (New Directions girls), "Borderline/Open Your Heart" (Rachel & Finn), "Vogue" (Sue with Mercedes and Kurt), "Like a Virgin" (Rachel, Jesse, Emma, Will, Santana & Finn), "4 Minutes" (Kurt & Mercedes), "What It Feels Like For A Girl" (New Directions boys and Will), "Like a Prayer" (New Directions and Choir)

Absent: Jessalyn Gilsig

Plot: Kurt (Chris Colfer) fixes up his father Burt (guest star Mike O'Malley) on a date with Finn's (Cory Monteith) mother, Carole (guest star Romy Rosemont), in hopes of having a regular family and of getting closer to Finn. His plan backfires when his father bonds with Finn over sports, leaving Kurt feeling excluded. Will (Matthew Morrison) rents out April Rhodes' (guest star Kristin Chenoweth) roller rink for New Directions as a temporary practice space. Meanwhile, Mercedes (Amber Riley) deals with weight issues after Sue (Jane Lynch) tells her to lose ten pounds for an upcoming Cheerios interview.

Singles: "Fire" (April & Will), "A House Is Not a Home" (Kurt & Finn), "One Less Bell to Answer/A House Is Not a Home" (April & Will), "Beautiful" (Mercedes with WMHS), "Home" (April with New Directions)

Absent: Jessalyn Gilsig, Jayma Mays

Plot: When the "Glist" – a salacious list about the sexual exploits of the glee club members – circulates the halls of McKinley High, Will (Matthew Morrison) begins an investigation to find out who compiled the list. Kurt (Chris Colfer), Mercedes (Amber Riley), Artie (Kevin McHale), Tina (Jenna Ushkowitz) and Brittany (Heather Morris) misbehave in an attempt to gain bad reputations, but their plans repeatedly backfire on them. Sue (Jane Lynch) is mortified when a video of her rendition of Olivia Newton-John's classic "Physical" is unearthed, but ends up being contacted by Newton-John herself to produce a new version. The episode was written by Ian Brennan and directed by Elodie Keene.

Singles: "Ice Ice Baby" (Will with New Directions), "U Can't Touch This" (Artie with Kurt, Mercedes, Tina & Brittany), "Physical" (Sue & Olivia Newton-John), "Run Joey Run" (Rachel, Puck, Jesse & Finn with Santana and Brittany), "Total Eclipse of the Heart" (Rachel, Finn, Puck & Jesse)

Absent: Jessalyn Gilsig

Plot: When Rachel (Lea Michele) panics after a sore throat affects her singing, Finn (Cory Monteith) attempts to help her get perspective on her condition. Jealous of the time his father is spending with Finn, Kurt (Chris Colfer) tries to emulate his masculine persona, and begins dating Brittany (recurring guest star Heather Morris). Puck (Mark Salling) dates Mercedes (Amber Riley) in a strategic move to elevate his social status, but ends up testing Mercedes' emotions in the process.

Singles: "Jessie's Girl" (Finn), "The Lady is a Tramp" (Puck & Mercedes), "The Boy is Mine" (Mercedes & Santana), "Rose's Turn" (Kurt), "One" (Rachel & Finn with Mercedes and New Directions)

Absent: Jessalyn Gilsig, Jayma Mays

Plot: Will's (Matthew Morrison) high school nemesis, Bryan Ryan (Neil Patrick Harris), causes trouble for the glee club, announcing his intent to cut them from the district budget. Furthermore, he competes with Will for the lead role in a local production of Les Misérables. Vocal Adrenaline coach Shelby (recurring guest star Idina Menzel) is revealed to be Rachel's (Lea Michele) biological mother, and enlists Jesse (recurring guest star Jonathan Groff ) to break the news to her. Tina (Jenna Ushkowitz) gives Artie (Kevin McHale) false hope that he may one day walk again, straining their relationship.

Singles: "Dream On" (Will & Bryan), "The Safety Dance" (Artie), "I Dreamed a Dream" (Shelby & Rachel), "Dream a Little Dream" (Artie)

Absent: Jessalyn Gilsig

Plot: The glee club pays tribute to Lady Gaga, donning some of her famous outfits. Will (Matthew Morrison) teaches the club about theatricality to help Tina (Jenna Ushkowitz) through an identity crisis. Rachel (Lea Michele) finally meets her mother Shelby (recurring guest star Idina Menzel) by accident during a sneak-in on a Vocal Adrenaline practice session, but neither feel an immediate mother–daughter bond. Meanwhile, Kurt's (Chris Colfer) father Burt (guest star Mike O'Malley) invites Finn (Cory Monteith) and his mother (guest star Romy Rosemont) to move in, but Finn is reluctant to share a room with Kurt.

Singles: "Funny Girl" (Shelby), "Bad Romance" (New Directions girls and Kurt), "Shout It Out Loud" (New Directions boys except Kurt), "Beth" (Puck and Finn with New Directions boys except Kurt), "Poker Face" (Rachel & Shelby)

Absent: Jessalyn Gilsig, Jane Lynch, Jayma Mays

Plot: After finalizing his divorce with Terri (Jessalyn Gilsig), Will (Matthew Morrison) seeks revenge against Sue (Jane Lynch) when she plans to install a cheerleading trophy cabinet in the choir room. The glee club learns that Jesse (recurring guest star Jonathan Groff) has defected to Vocal Adrenaline, forcing Rachel (Lea Michele) to deal with her emotions as she discovers that Jesse was using her to bring the club down. Meanwhile, Mercedes (Amber Riley) and Quinn (Dianna Agron) face off in a funk-off.

Singles: "Another One Bites the Dust" (Jesse with Vocal Adrenaline), "Tell Me Something Good" (Will), "Loser" (Finn & Puck with Sheets-N'-Things workers), "It's a Man's Man's Man's World" (Quinn), "Good Vibrations" (Mercedes, Puck & Finn), "Give Up the Funk (Tear the Roof Off the Sucker)" (Kurt, Mercedes, Finn, Tina, and Artie with New Directions)

Absent: Jayma Mays

Plot: New Directions competes against Vocal Adrenaline and Aural Intensity, seen here for the first time, at Regionals, in front of celebrity judges Olivia Newton-John, Josh Groban, Sue, and Rod Remington. Meanwhile, Will (Matthew Morrison) and Finn (Cory Monteith) profess their love for Emma (Jayma Mays) and Rachel (Lea Michele) respectively and Quinn (Dianna Agron) goes into labor immediately after their performance.

Singles: "Faithfully" (Finn & Rachel), "Any Way You Want It/Lovin' Touchin' Squeezin'" (New Directions), "Don't Stop Believin'" (New Directions), "Bohemian Rhapsody" (Jesse with Vocal Adrenaline), "To Sir, With Love " (New Directions), "Over the Rainbow" (Will with Puck)

Absent: Jessalyn Gilsig