Three NBC series hit historic lows in the Nielsen overnight ratings Thursday night as the network finished in fifth place among the broadcast networks in both total viewers and the key 18-49 demo, TVbytheNumbers.com reports.

“The Office,” “Parks & Recreation” and “Awake” all sank to new series lows in 18-49. “The Office” slipped one-tenth of a ratings point from last week to a 2.1 average rating; “Parks & Recreation” fell one-tenth to a 1.7; and “Awake” was down one-tenth to a disturbingly low 0.8.

Meanwhile, two of the network’s shows posted slight upticks. “30 Rock” managed to climb one-tenth for its special live broadcast, scoring a 1.6 in 18-49; and “Community” was up one-tenth from a series low a week earlier, posting a 1.4.

CBS’s “The Big Bang Theory” was the highest-rated show of the night in the 18-49 demo with a 4.0 average, just ahead of Fox’s “American Idol” with a 3.9. “Big Bang’s” 4.0 was a season low.

CBS’s “Rules of Engagement” bounced back from its series low last week, climbing three-tenths to a 2.5 in viewers 18-49. But CBS’s “Person of Interest” (2.4 average rating in 18-49) and “The Mentalist” (2.1) both hit new series lows.

ABC’s “Missing” also hit a series low, dipping to a 1.3 in 18-49. Fox’s “Touch” joined the epidemic of series lows with a 1.9.

When the dust settled, Fox was No. 1 for prime time, averaging a 2.9 in the 18-49 demo to beat CBS (2.6), ABC (2.2), Univision (1.5) and NBC (1.4). CBS won total viewers with an average of 11.6 million to 10.5 million for Fox, 7.7 million for ABC, 3.7 million for Univision and 3.1 million for NBC.