Jack Donaghy (Alec Baldwin) calls Liz Lemon (Tina Fey) up to his office and informs her that Hank Hooper (Ken Howard), CEO of the fictional NBC parent Kabletown, wants to meet them. It turns out that Hooper was already in the room, sitting in Jack’s chair, and he goes on to tell Liz that without Tracy Jordan (Tracy Morgan), he has decided to cancel TGS, the fictional show-within-a-show where Liz is the head writer. Jack tells Hank that Tracy is back and that he should give TGS one more episode, their hundredth, and then reconsider. Hank approves of this decision and leaves. Jack asks Liz if Tracy really is back and Liz confirms this and says that she has prepared to help Tracy ruin his goodwill so that no one will take him seriously anymore. Jack then goes on to say that he is tired of covering for Liz before she leaves.
Jenna Maroney (Jane Krakowski) is reminiscing with Danny Baker (Cheyenne Jackson) about their time on the show for the past five years (completely forgetting former cast member Josh Girard and not knowing that Danny just came in last year). The idea of her becoming a mother comes up, which she initially dismisses. However, when Kenneth (Jack McBrayer) suggests she would make a great mother, she reconsiders, and begins plotting to have a baby to augment her career.
It is Tom the janitor’s (Michael Keaton) last day at work when he discovers a gas leak that is seeping into the ventilation system of the Sixth floor which causes strange behavior among the personnel. Liz hallucinates seeing the Blue Man (Rachel Dratch) and talks to it about how her life was better off before. Meanwhile, Tom and TGS producer Pete Hornberger (Scott Adsit) tell Jack that the TGS personnel will be evacuated. Jack tells them that he doesn’t care, but lets them do it. The entire floor is evacuated, and the crew is forced to temporarily work on their episode outside. The evacuation, therefore, delays production on their 100th episode. Liz hallucinates seeing the Blue Man (Rachel Dratch) and talks to it about how her life was better off before.
While repairing the gas leak, Tom inadvertently breaks the ventilation system of the 52nd floor causing Jack to hallucinate that he is visited by several versions of himself, first by an alternate reality version of himself – who fired Liz, and claims that she was holding him back, and made his way to the top of the GE management structure. Jack then heads out of the building.
Jack approaches Liz and severs their relationship. Liz is then approached by her ex-boyfriend Dennis (Dean Winters), whom she had called while under the influence of the gas in an attempt to rekindle their relationship an hour earlier. Liz rejects Dennis, who realizes that she will accept him if she is affected by the gas leak, and undoes the repairs to the ventilation system.
Meanwhile, Tracy is attempting to sabotage the respect he is earned, but his attempts fail, as the talk shows he appears on interpret his crude behavior as artistic expression. He discusses the problem with Jenna, and the two realize his only choice to undo the good will he has earned is to commit a murder. Tracy convinces Kenneth to let him shoot Kenneth on the roof of the building.
In a fit of obsession over having a baby, Jenna tells “Dr.” Leo Spaceman that she got a hysterical pregnancy and questions her desire to get pregnant. Meanwhile, the gas affects Pete to the extent that he falls in love with Greta Johansen. As these two events happen, Danny is singing on the TGS stage and has memories of past events that happened to former cast member Josh Girard (Lonny Ross) before he trips.
With the gas spreading in the ventilation, Jack is then visited by a past version of himself (from the 80′s), who encourages him to take the advice of their alternate-reality self (who is also present). When they arrive at the elevator Jack meets a third version of himself, from the future, who claims that he needs Liz to distract him from his blind ambition as much as Liz needs him, and he will be much happier in the future if he doesn’t fire her. He tells present Jack that Liz is about to sign a lease with Dennis and that in his future, Liz and Dennis get married and live in Jacksonville, Florida. As Jack heads off to the TGS building, the three different Jacks propose to have sex with each other.
Jack finds Liz and prevents her from signing Dennis’ lease (which is actually just, as he claims, a receipt for “some lez pants you [Liz] bought”). Tom tells everyone about the gas line sabotage and Dennis is eventually caught as the culprit and leaves. Liz then tells Jack that she saw Kenneth and Tracy heading for the roof with a gun. Jenna joins them in heading up the roof. They are met by Hank Hooper near the elevators and talks to Jenna about a Daytime talk show. With a focus on a career over a child, Jenna gleefully accepts and after Hank leaves, they realize that Jenna’s hysterical pregnancy had suddenly vanished. They head for the roof and arrive in time to prevent Tracy from shooting Kenneth. Jack tells Tracy that the best way to lose respect as an actor is to return to television (he gives the speech reciting Alec Baldwin’s career). Jack gets the gun from Tracy before they leave.
When they are headed for the TGS set, they meet Tom, who tells them that while repairing the ventilation systems, he somehow broke the elevator, forcing them to take the stairs. They leave for the stairs as a gunshot is heard. Tom talks to himself about how excited he is that it is his last day at work and that he is about to meet his girlfriend when he realizes that he has been shot (ironically, earlier, he shows his girlfriend’s picture to his co-workers and subsequently questions why, as it will “jinx everything up.”).
While Jack, Liz, Tracy, Jenna, and Kenneth go down the stairs, they meet several people (including Brian Williams). They eventually make it back to the TGS set, where Liz discovers that the entire show was written under the influence of the gas and is essentially worthless. Liz again breaks the gas line, and with Hooper and the entire audience affected by the gas, the show is a hit, and Hooper renews it for “a billion more episodes”.
Tom Hanks is watching the TGS episode at home and upon seeing Tracy on TV, he calls George Clooney (who does not appear in the episode) on a phone and tells George to have Tracy removed from the “official A-list”. After hanging up, Tom continues to sew something while singing a song.
Liz and Jack apologize to each other and toast to imaginary champagne.
During the credits, Jenna, Tracy, and Kenneth all imagine where they will be in five years. The scene cuts to their tombstones. Tracy and Jenna apparently die on the same die, while Kenneth died a few days later. His birth date is finally revealed to be May 27th, 1781, after which his hand appears above the grave and gives a thumbs up.
First broadcast April 21, 2011 on NBC Network “100″ is the twentieth episode of the fifth season of the American television comedy series 30 Rock, and the 100th overall episode of the series. It was written by Jack Burditt and the show’s executive producers Robert Carlock and Tina Fey, who is also the series’ creator, head writer, and star.
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