Fast National ratings for Thursday, May 6, 2010.
 
All three of CBS' Thursday originals were up from last week in total viewers and steady in the key demo, with "Survivor: Heroes vs. Villains," "CSI: Crime Scene Investigation" and "The Mentalist" all winning their hours and pacing the network's comfortable victories.
 
Among adults 18-49, CBS averaged a 3.5 rating, topping the 2.6 rating for ABC. NBC's 2.4 rating and the 2.3 rating for FOX were close behind in the all-important demographic. The CW's 1.4 rating was fifth.
 
Overall, CBS averaged an estimated 13.9 million viewers to go with an 8.5 rating/15 share. ABC's 5.3/9 was a distant second, just ahead of the 4.7/8 for FOX. NBC finished fourth with a 3.2/6, still beating the 1.8/3 for The CW.
 
CBS' sweep started at 8 p.m. with the 7.6/13 for "Survivor: Heroes vs. Villains," which also did the night's best demo with a 4.0 rating. FOX's "Bones" was second with a 5.7/10. ABC's "FlashForward" was third with a 3.1/5, but fifth in the key demo with a 1.3 rating. NBC's "Community" and "Parks and Recreation" was a close fourth overall and finished third in the key demo. The CW's "The Vampire Diaries" had a 2.0/4 and a 1.6 demo rating.
 
"CSI: Crime Scene Investigation" had an 8.8/14 overall to win the 9 p.m. hour. ABC's "Grey's Anatomy" was second overall with a 7.2/12, but won the hour in the demo with a 3.7 rating. NBC's "The Office" and "30 Rock" averaged a 3.8/6, nipping FOX's "Fringe" (slightly up this week). The CW's "Supernatural" was fifth with a 1.6/3.
 
"The Mentalist" delivered the night's biggest overall audience for CBS, doing a 9.3/16 with 14.73 million viewers and a 3.3 demo rating in the 10 p.m. hour. ABC's "Private Practice" was second with a 5.7/10. NBC's "The Marriage Ref" improved from last week, but still finished a distant 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.