On show night, Liz Lemon grows increasingly infuriated when no one seems to remember that it's her 40th birthday. Just before the taping, Tracy Jordan becomes convinced that nothing is funnier than a performer laughing and breaking character, which he elects to do all night, much to Jenna Maroney's chagrin. Meanwhile, Jack Donaghy struggles with the consequences of his promise to give up drinking while Avery is pregnant. The episode was filmed twice. The East Coast version aired for the Eastern, Central and Mountain time zones. The West Coast version was aired in the western, Alaskan and Hawaiian time zones.

Liz has trouble adjusting to being a stay-at-home mother. Jack takes stock of his life, and Tracy struggles to get on without Kenneth.

Liz tries to turn her personal life from drab to fab by revamping her dream apartment. Meanwhile, Avery is held hostage, and Tracy discovers that Kenneth, Dot Com and Grizz have forged a solid bond while he was away.

Liz hires a new female writer after a blog declares "TGS" misogynistic. Meanwhile, Jack plots his takeover of Kabletown by zeroing in on his main competition--the CEO's granddaughter.

Jack's biological father's health hangs in the balance as the pair start to build a relationship. Liz draws some attention as a relationship expert, despite her own many failed relationships, after an appearance on a talk show. Tracy is invited to speak at his old high school and Kenneth helps him overcome some embarrassing memories from those years.

Liz schedules a root canal to avoid feeling lonely on Valentine's Day; Jack woos an attractive and successful TV host; Jenna's stalker loses interest.

Liz questions fate when she meets the man of her dreams, while Jack's love triangle between high school love, Nancy Donovan, and CNBC anchor, Avery Jessup, comes to a head. Meanwhile, Jenna's boyfriend is confronted with a similar dilemma when his desire for another woman threatens to ruin their relationship, and Kenneth, with the help of Tracy, tries to avoid a promotion that would land him in LA.

"TGS" is forced into hiatus, spurring the show's staffers to seek backup jobs. Meanwhile, Jack tries to rescue a cable network by forging an unlikely alliance with his archenemy, Devin Banks.

Chaos builds when bigwig Hank Hooper marks "TGS" for cancellation, yet Jack persuades him to let the staffers stage the show's 100th episode.

Fed up with New York City after being mugged, Jack sets out to protect the safety of the city's elite by announcing his run for mayor. Meanwhile, Liz revels in sacrificing the good of the city to look out for her own interests, and Jenna and Paul are thrilled by the perversion of acting like a normal couple.

Liz's scripted version of Jack and Avery's love story leaves Jack confused and frustrated by his feelings for Diana. Meanwhile, Jenna and Tracy attempt to beat Weird Al Yankovic at his own game, and Kenneth gets an unexpected new job at NBC.

Jack sees an opportunity for budget cuts when Josh's contract is up, forcing Liz to go out of her way to motivate Josh into staying with TGS and not moving on to a rival show. Meanwhile, Kenneth earns a coveted spot in Tracy's entourage and Jenna gets in trouble over a misquote in Maxim.

Jack manages to convince a reluctant Liz to attend her high school reunion. Meanwhile, Don Geiss awakens from his coma and shocks Jack with a declaration of who he wants to be the CEO of GE. A shaken Jack decides he needs to get away and blow off some steam, but tags along with Liz to her reunion instead due to bad weather.

Liz tries to begin a relationship with a new tenant after accidentally receiving his mail. Meanwhile, Jack's appearance causes Elisa's grandmother to disapprove of the relationship, and Tracy has trouble maintaining the lifestyles of Wall Street frat boys.

A reality TV series trails Tracy, which Liz tries to exploit for her own gain. Jack does his own exploiting: He attempts to make a fast buck off natural-disaster telethons. And Lutz sets out to increase his worth in the event of an apocalypse.

Jack and a very pregnant Avery take a romantic break in Canada. When Avery goes into labor, the power couple desperately scramble to not give birth to a Canadian. Meanwhile, Liz's getaway with Carol gets grounded, literally, when their plane collects dust on the tarmac. And Tracy is an EGOT winner, but with that comes overwhelming demands.

As cancellation looms for "TGS", Liz snoops with Kenneth to find a missing Tracy. Meanwhile, Jack works his magic to ensure the financial success of Jenna's newest endeavor; and an emasculated Pete organizes a manly contest for the writers and crew.

With their show targeted for cancellation, the "TGS" crew desperately scramble to mount a top-notch production for their 100th episode. Meanwhile, Jack reconsiders a vital decision in his life, and Jenna mulls over motherhood.

In order to hide his relationship with Lynn, Frank convinces his mother that he is dating Liz. Tracy and Jenna team up to try to solve the case of Pete's missing whisky. Meanwhile, Jack teaches Kenneth how to take down his first business nemesis.

Liz wonders if she's actually on a date with Jack as she accompanies him to a birthday celebration for a foreign prince. While at the ball, Liz sees a different side to Jack as he unexpectedly runs in to his ex-wife. Back at 30 Rock, Tracy tempts Pete with a booze- and babe-filled party in the office, while Kenneth tries to keep Pete on the straight and narrow.

As the cast and crew of TGS with Tracy Jordan returns for a new season, Liz is excited to see Jack again. However, her excitement quickly fades as Jack insists that Liz is still not over Floyd. Meanwhile, Jerry Seinfeld shows up at Jack's office in an upset mood after Jack announces his newest plan. Finally, Kenneth becomes Tracy's office wife when Tracy separates from his wife and Jenna returns to set a whole lot heavier now that she has been involved in Mystic Pizza: The Musical!.

Liz heads to Chicago to get out of jury duty and on her flight back to New York she is assigned a seat next to Oprah. Liz seizes the opportunity to ask Oprah for advice with some of the problems she's been having. Back in New York, the feud continues between Tracy and Jenna, and Jack's morals are tested by Kenneth after an Olympics snafu.

While Jack puts together the perfect 50th birthday party for himself, home videos inspire him to try to recreate his happiest moment. Dennis decides to tell Liz about his addiction. Meanwhile, Kenneth and Pete work to make Tracy's childhood dream come true.

The "TGS" crew anticipate their summer vacation. Liz lands in the Hamptons for some rest and relaxation, but she gets the summertime blues when Tracy moves in next door. Elsewhere, a lonely Jack latches onto Kenneth for company; and Jenna's new job impacts her relationship with Paul.

After an encounter with Dennis Duffy, Liz and Criss decide to take drastic measures to start a family. As Liz looks toward the future, Jack and Jenna evaluate their own self-worth, and Tracy laments a shocking medical diagnosis.