Tina Fey’s NBC sitcom saw its sophomore season cut from 22 episodes to 15 by the strike, but the extra time it gave the writers led to a game-changing idea.

During the strike, the "30 Rock" cast performed a live version of an episode at New York’s Upright Citizens Brigade, and it went so well, it inspired Fey and company to do a live episode on NBC — which they actually did twice, in Seasons 5 and 6.

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