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Based more-than-loosely on backstage shenanigans at "Saturday Night Live," "30 Rock" centers on young Liz Lemon, currently head writer for a live sketch-comedy show in New York. Complications follow when the network's new president orders Liz to hire mentally unstable movie star Tracy Jordan to join the cast, throwing neurotic leading lady (and Liz's best friend) Jenna Maroney... Wikipedia