NBC gameshow “Identity” declined as expected Tuesday in its second perf this week, but the skein performed pretty well, narrowly winning the night’s opening hour among young adults.

According to preliminary nationals from Nielsen, “Identity” earned a slot-leading 2.9 rating/8 share in adults 18-49 and averaged 8.2 million viewers overall, edging out ABC special “I Want a Dog for Christmas, Charlie Brown” (2.8/8 in 18-49, 8.9 million viewers overall). The Peacock gamer delivered the best scores in the time period for the net in three months, rising to become the clear demo leader at 8:30 when a contestant won the show’s maximum prize of $500,000.

In Monday’s premiere, “Identity” logged a 4.4/11 in 18-49 and 12.3 million viewers overall, taking advantage of its sizable “Deal or No Deal” lead-in. The Wednesday and Thursday perfs of “Identity” will be key for NBC in determining whether it has a show that could become a series regular at midseason. Last season, the Peacock effectively launched “Deal or No Deal” during this typically slow week to very good numbers, and the skein went on to become a regular series a couple of months later.

The only other firstrun program on the broadcast nets Tuesday night was ABC’s struggling laffer “Big Day,” which averaged a fourth-place 1.7/5 in 18-49 and 4.7 million viewers overall for a pair of episodes from 9 to 10. Fox drama “House” dominated the hour with a repeat (3.8/10 in 18-49, 10.0 million viewers overall).

A repeat of CBS drama “NCIS” (2.5/7 in 18-49, 11.2 million viewers overall) was the night’s most-watched program overall.

Preliminary 18-49 averages for the night: Fox, 3.2/9; NBC, 2.7/8; CBS, 2.5/7; ABC, 2.0/6; Univision, 1.7/5; CW, 1.1/3.

In total viewers: CBS, 9.4 million; Fox, 8.5 million; NBC, 8.3 million; ABC, 6.2 million; Univision, 4.0 million; CW, 2.6 million.