Fast National ratings for Tuesday, June 24, 2008.

NBC's "America's Got Talent" had more eyeballs, but the premieres of two ABC extreme reality shows drew in younger viewers on Tuesday.

Overall, NBC averaged a 6.6 rating/11 share, comfortably ahead of the 5.0/9 for CBS and the 4.8/8 for ABC. FOX's 3.5/6 was good for fourth, while The CW's 1.0/2 brought up the rear.

Among adults 18-49, though, ABC's averaged a 3.1 rating, beating NBC's 2.8 rating to win the key demographic. FOX moved up to third with a 2.4 rating. CBS' 1.4 rating and the 0.6 rating for The CW trailed.

In the 8 p.m. hour, NBC's "Celebrity Family Feud" had a 5.8/10, edging the 5.7/10 for ABC's "Wipeout," though the splashy ABC series averaged more viewers and dominated the young adult demos. CBS' "NCIS" was third with a 5.2/9, while FOX's "Hell's Kitchen" encore and The CW's "Beauty and the Geek" drew minimal attention.

NBC grabbed a commanding lead at 9 p.m. with the 6.8/11 for "America's Got Talent." CBS' "48 Hours Mystery" took second, beating the 4.8/8 for FOX's new "Hell's Kitchen." ABC's "I Survived a Japanese Game Show" lost much of its lead-in, falling to a 4.4/7, but still finished second in the demo. The CW's "Reaper" had a 1.2/2.

"America's Got Talent" closed strong for NBC with a 7.2/12 in the 10 p.m. hour. CBS' "Without a Trace" had a 4.6/8, edging ABC's Amish-centric "Primetime" special.

Ratings information is taken from fast national data, which includes live and same-day DVR viewing. All numbers are preliminary and subject to change.