NBC rolled over its primetime competish Sunday on the towering strength of the opening night of two-part earthquake pic “10.5,” according to preliminary nationals from Nielsen.

“10.5” averaged a big 8.0/19 in adults 18-49 and 20.4 million viewers overall to easily rate as the No. 1 program of the night and the top-rated movie of the season. Only a subpar showing by “Dateline” from 8 to 10 (2.0/6 in adults 18-49, 6.9 million viewers overall) kept the Peacock from scoring a convincing victory on the opening Sunday of the May sweep.

ABC and Fox tied for second in adults 18-49, with the former led by another big outing by 8 o’clock reality skein “Extreme Makeover: Home Edition” (series high 5.3/14 in adults 18-49, 12.8 million viewers overall) and the latter by an hour of “The Simpsons” (4.5/12 in adults 18-49, 9.4 million viewers overall).

CBS was paced as usual by solid 8 o’clock drama “Cold Case” (3.5/9 in adults 18-49, 14.0 million viewers overall). Net’s original movie “The Book of Ruth” settled for a 3.2/8 in adults 18-49 and averaged 11.6 million viewers overall.

Preliminary 18-49 averages for the night: NBC, 5.0/13; ABC, 3.9/11, tied with Fox, 3.9/11; CBS, 3.0/8′ WB, 1.3/4.

In total viewers: NBC, 13.6 million; CBS, 12.4 million; ABC, 9.7 million; Fox, 8.4 million; WB, 2.9 million.