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

(NBC)
12 of 26

'Rock Center with Brian Williams' (NBC)

Viewers: 3.76 million
Rank: 87th in viewers, t-92nd in 18-49 (1.0)
Fun fact: A whole lot more people (about 9 million people per night, on average) watch Brian Williams on the "NBC Nightly News" than on his weekly prime-time show.