NBC scored a convincing Monday victory in key demo categories thanks to its frightful combo of “Fear Factor” and earthquake movie “10.5,” according to preliminary nationals from Nielsen.

The conclusion of two-night pic “10.5” averaged a big 7.8/19 in adults 18-49 and 19.6 million viewers overall, slightly below its monstrous opening-night ratings Sunday. Net also won in all key demo categories in the opening hour with “Fear Factor” (5.1/15 in adults 18-49, 12.2 million), which had tougher competish than usual from a special edition of Fox’s “American Idol” (4.6/13 in adults 18-49, 11.4 million viewers overall).

CBS did well from 9 to 11 with “Everybody Loves Raymond” (5.7/14 in adults 18-49, 17.2 million viewers overall), “Two and a Half Men” with guest star Heather Locklear (5.8/14 in adults 18-49, 16.3 million viewers overall) and “CSI: Miami” (6.2/15 in adults 18-49, 17.3 million viewers overall).

Fox’s “The Swan” again delivered solid numbers at 9 (4.5/11 in adults 18-49, 10.0 million viewers overall), while ABC struck out with the premiere of theatrical “Unbreakable” (1.9/5 in adults 18-49, 5.5 million viewers overall).

Preliminary 18-49 averages for the night: NBC, 6.9/18; CBS, 5.0/13; Fox, 4.6/12; WB, 2.0/5; ABC, 1.9/5; UPN, 1.3/3.

In total viewers: NBC, 17.2 million; CBS, 14.7 million; Fox, 10.7 million; WB, 5.9 million; ABC, 5.5 million; UPN, 3.2 million.