In a battle of all-original lineups, the ”Big Bang Theory”-led CBS prevailed in key demos over Fox’s combo of ”X Factor” and ”Bones.” NBC aired a special episode of Friday rookie drama ”Grimm” to nothing-special numbers.

(Note that due to preemptions for football in Pittsburgh and Cleveland, respectively, ratings for CBS and Fox are subject to revision in the nationals.)

According to preliminary national estimates from Nielsen, CBS opened a winner with ”The Big Bang Theory” (4.7 rating/14 share in 18-49, 14.4 million viewers overall), the No. 1 show of the night but down from its recent lofty levels. It was followed by ”Rules of Engagement” (3.2/9 in 18-49, 11.0 million viewers overall), ”Person of Interest” (3.0/8 in 18-49, 13.4 million viewers overall) and ”The Mentalist” (3.0/8 in 18-49, 13.7 million viewers overall), with the latter two dramas at or near season highs (though expected to come down some in the nationals due to football).

At least in the preliminaries, CBS swept the night in 18-49, 25-54 and total viewers.

Elsewhere, Fox’s ”The X Factor” results show (3.0/8 in 18-49, 9.9 million viewers overall) and ”Bones” (2.7/7 in 18-49, 9.0 million viewers overall) were in line with last week but could come down a bit in the nationals due to football. ”X Factor” eliminated one of its final five contestants as it approaches its Dec. 22 season finale.

NBC aired original episodes of comedies ”Community” (1.5/4 in 18-49, 3.6 million viewers overall), ”Parks and Recreation” (1.7/5 in 18-49, 3.7 million viewers overall), ”The Office” (2.9/8 in 18-49, 5.8 million viewers overall) and ”Whitney” (1.9/5 in 18-49, 4.1 million viewers overall) , all on the low end of their range. ”Office” was easily the No. 1 broadcast program in its timeslot among adults 18-34 (3.4/10) and it, ”Parks” and ”Whitney” all led their half-hours among men 18-34.

At 10, a special episode of drama ”Grimm” (1.6/4 in 18-49, 4.1 million viewers overall) matched its most original perf on Friday but did fare better than all but the premiere episode of ”Prime Suspect” to air in the timeslot this fall. Another original ”Grimm” airs tonight.

ABC had a fairly quiet night but hung in there with specials ”Winter Wipeout” (1.9/5 in 18-49, 6.6 million viewers overall), ”America’s Funniest Home Videos Christmas Spectacular” (1.9/5 in 18-49, 6.5 million viewers overall) and ”The Great Big American Auction” (1.4/4 in 18-49, 4.8 million viewers overall).

CW aired repeats of ”The Vampire Diaries” (0.4/1 in 18-49, 1.2 million viewers overall) and ”The Secret Circle” (0.3/1 in 18-49, 0.9 million viewers overall).

And Univision had a solid showing for its 10 p.m. special ”La Amenaza Irani” (The Iranian Threat), the latest production from Documentales Univision. It averaged a 1.1/3 in 18-49 and 2.5 million viewers overall.

Preliminary 18-49 averages for the night: CBS, 3.3/9; Fox, 2.8/8; NBC, 1.9/5; ABC, 1.7/5; Univision, 1.4/4; CW, 0.4/1.

In total viewers: CBS, 13.3 million; Fox, 9.5 million; ABC, 6.0 million; NBC, 4.2 million; Univision, 3.2 million; CW, 1.1 million.