Fast National ratings for Thursday, January 21, 2010.

FOX got big numbers from "Bones" in the 8 p.m. hour, but otherwise Thursday held true to form, with CBS winning overall and ABC taking the key demographic.

Among adults 18-49, ABC averaged a 3.4 rating, topping the 3.1 rating for FOX in the key demographic. CBS was third with a 2.8 rating, with NBC's 2.2 rating and the 1.4 rating for The CW trailing.

Overall, though, CBS averaged an estimated 11.97 million viewers and a 7.5 rating/12 share. ABC's 6.5/10 was second, with FOX's 5.6/9 a close third. NBC was a distant fourth with a 3.2/5, while The CW's 2.0/3 was fifth.

FOX started the night with a commanding win, getting a 7.2/11 for "Bones," with a 3.5 demo rating. The premiere of ABC's "The Deep End" was second overall with a 4.7/7, though the new legal dramedy was fourth on the hour in the key demographic. Two repeats of "The Big Bang Theory" had CBS in third for the hour, beating NBC's new episodes of "Community" and "Parks and Recreation," which averaged a 2.9/5 between them. The CW's return of "The Vampire Diaries" had a 2.3/4, averaging nearly 3.69 million viewers and a 1.6 demo rating.

At 9 p.m. CBS won overall with an 8.8/14 for "CSI: Crime Scene Investigation," though the CBS procedural averaged a lower-than-normal 3.1 demo rating. ABC's "Grey's Anatomy" had an 8.3/13 overall and won the hour with a 4.6 demo rating. FOX's "Fringe" had a 4.1/6 for third, beating the 3.8/6 for NBC's "The Office" and "30 Rock." The CW's "Supernatural" was fifth.

CBS' "The Mentalist" had a 9.2/15 to win the 10 p.m. hour overall. ABC's "Private Practice" was second overall with a 6.6/11 and won the hour with a 3.6 demo rating. NBC's "The Jay Leno Show" finished third.

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