dateline nbc ratings TV Ratings: 'Dateline: NBC' tops Friday night reruns with biggest audience since September 2011Fast National ratings for Friday, Dec. 28, 2012.

A two-hour rerun of “Dateline: NBC” led a quiet night of repeat programming, giving the Peacock net the lead in average total viewers (5.4 million) and adults 18-49 (1.4).

In its second hour, “Dateline” attracted a whopping 4 million more viewers than the previous week, and its 6.8 million viewer average marked the show’s biggest overall audience for a Friday telecast since September 2011.

ABC earned the second-place spot (5.33 million viewers, 1.1 rating) with a “Shark Tank” rerun and “Back to the Beginning With Christiane Amanpour.” CBS’ “Undercover Boss” marathon drew an average of 4.56 million viewers (1.0), while FOX followed in fourth place (2.35 million, 0.8) with post-Christmas specials “Dreamworks Dragons: Gift of the Night Fury” and “Ice Age: A Mammoth Christmas.” The CW averaged 1.06 million viewers and 0.2 rating for its “Nikita” and “Arrow” encores.

]]>Friday hour by hour: 8 p.m. CBS: “Undercover Boss” rerun (5.5 million viewers, 3.6/6 households)
ABC: “Shark Tank” rerun (5.4 million viewers, 3.5/6 households)
NBC: “Go On” reruns (3.5 million viewers, 1.8/3 households)
FOX: “Dreamwork Dragons: Gift of the Night Fury” (2.9 million viewers, 1.6/3 households) / “Ice Age: A Mammoth Christmas”(2.7 million viewers, 1.5/3 households)
The CW: “Nikita” rerun (1 million viewers, 0.7/1 households) 18-49 leader: “Shark Tank” (1.4) 9 p.m. NBC: “Dateline: NBC” rerun (5.9 million, 3.9/7)
ABC: “Back to the Beginning With Christiane Amanpour” (5.3 million, 3.2/6)
CBS: “Undercover Boss” (rerun) (4.4 million, 3.0/5)
FOX: “Kitchen Nightmares” rerun (1.9 million, 1.2/2)
The CW: “Arrow” rerun (1.1 million, 0.8/1) 18-49 leader: “Dateline: NBC” (1.5) 10 p.m. NBC: “Dateline: NBC” rerun (7.8 million, 5.1/9)
ABC: “Back to the Beginning With Christiane Amanpour” (5.3 million, 3.4/6)
CBS: “Undercover Boss” (rerun) (3.8 million, 2.6/5) 18-49 leader: “Dateline: NBC” (1.9) Ratings information includes live and same-day DVR viewing. All numbers are preliminary and subject to change. Source: The Nielsen Company. More ratings at Zap2It: Daily, weekly and cable