Fast National ratings for Tuesday, Jan. 6, 2009.

Original programming returned in a rush on Tuesday night, with positive results for CBS' procedurals, NBC's "Biggest Loser: Couples" and even some bright signs for ABC's "Scrubs" premiere.

NBC won the night among adults 18-49, doing a 4.3 rating in the key young adult demo. CBS was second with a 3.4 rating, followed by the 2.7 rating for ABC, FOX's 1.8 rating and The CW's 1.1 rating.

Overall, though, CBS won by a wide margin, averaging 17.3 million viewers and a 10.8 rating/17 share. NBC was second with a 7.0/11. ABC was a distant third with a 4.4/7, with FOX's 3.1/5 and The CW's 1.5/2 trailing.

CBS kicked the night off strongly with an 11.6/18 for "NCIS." The first hour of NBC's "Biggest Loser: Couples" was second with a 6.5/10. ABC's "Homeland Security USA" had a 4.8/7 in its premiere. FOX's "House" was third, followed by The CW's "90210," which was down to a 1.8/3 in its 2009 premiere.

At 9 p.m. CBS' "The Mentalist" delivered the night's biggest audience with a 12.3/19. NBC's "Biggest Loser: Couples" was second for the hour, but topped "The Mentalist" in the key 18-49 demo. "Scrubs" was a distant third for ABC with a 4.0/6, though the show's 3.1 rating in the 18-49 was respectable. FOX's "Fringe" was fourth, while The CW's "Privileged" had a 1.1/2.

"Without a Trace" closed primetime with an 8.5/14 for CBS. NBC's "Law & Order: Special Victims Unit" was second with a 7.0/12. ABC's "What Would You Do?" special was third.

All ratings information comes from preliminary Fast National data, which includes live and same-day DVR viewing. All numbers are subject to change.