Fall 2012's least-watched shows by network: Zap2it's Year in Review

(NBC)
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'Up All Night' (NBC)

Viewers: 3.91 million
Rank: 86th in viewers, t-68th in 18-49 (1.8)
Fun fact: A creative revamp of the show in Season 2 didn't bring in any new viewers -- this time last season, the NBC comedy was averaging about 6.3 million viewers.