The combination of “American Idol” and “24” brought Fox a primetime ratings victory on Tuesday as it more than doubled the young-adult averages of its rivals.

Also on the night, the WB’s freshman drama “One Tree Hill” achieved some highs with its season finale and CBS drew a solid turnout for its “Dick Van Dyke Show” spec.

According to Nielsen, “American Idol” (9.6 rating/29 share in adults 18-49, 23.27 million viewers overall) was easily Tuesday’s top show, besting each of its broadcast rivals in the 8 o’clock hour by 20 shares or more in 18-49. And “24” (5.3/14 in 18-49, 12.19m) continues to pick up steam down the stretch, winning its hour in 18-49 with its top score of the season.

CBS enjoyed its best Tuesday since December (3.0/8 in 18-49, second-place 4.2/12 in 25-54), getting a nice boost from spec “The Dick Van Dyke Show Revisited” (3.4/9 in 18-49, 14.57m). Comedy update was No. 2 for the 9 o’clock hour in adults 25-54 (4.7/11) and led its slot in total viewers.

The Eye also picked it up at 10 with season highs for “Judging Amy” (3.4/9 in 18-49, 12.28m).

NBC did only so-so with its 9 o’clock “Dateline” spec on the cast and producers of “Frasier” (3.5/9 in 18-49, 9.71m) but led as usual in demos at 10 with “Law & Order: SVU” (5.0/13 in 18-49, 12.28m). And ABC was paced by a tame season-finale score for “NYPD Blue” (3.4/9 in 18-49, 9.12m).

Season finale of the WB’s “One Tree Hill” (1.8/5 in 18-49, 4.49m) notched new highs in various categories including adults 18-34 (2.8/8) and females 12-34 (4.8/13), where it led the 9 o’clock hour. Net’s “Gilmore Girls” (2.1/6 in 18-49, 4.61m) ranked behind only “Idol” at 8 in young femme demos and logged its best adults 18-34 rating (2.7/9) since October.

UPN also scored at 9 with spec “America’s Next Top Model: The Runway Ahead” (2.0/5 in 18-49, 3.96m), which landed second for the hour in women 18-34 (4.1/11).

For the night, Fox’s 7.4/21 in 18-49 towered over runner-up NBC (3.5/9).