On a night when Fox’s “Glee” achieved a series-high demo score with its Britney Spears episode and lead-out comedy “Raising Hope” held up well in its second outing, ABC had reason to be happy with good sampling — in a tough timeslot — for its new drama “No Ordinary Family.”

According to preliminary nationals from Nielsen, “Glee” averaged a big 5.8 rating/16 share in adults 18-49 and 13.3 million viewers overall in the 8 o’clock hour, up 4% from its opening-week score, which stood as premiere week’s No. 1 entertainment series in adults 18-49. The musical comedy becomes the first series since NBC’s “Seinfeld” in 1993 to open as the top series of the week and then improve in week 2.

Also for Fox, which won the night in adults 18-49 and was up sharply vs. last year, 9 p.m. comedy “Raising Hope” (3.2/9 in 18-49, 7.5 million viewers overall) grew a tick from its OK premiere. The net’s 9:30 p.m. half-hour, “Running Wilde,” however, dropped a few ticks from its premiere (2.1/5 in 18-49, 4.7 million viewers overall).

At ABC, “No Ordinary Family” opened with a solid 3.1 rating/9 share in adults 18-49 and 10.5 million viewers overall — placing third in its tough 8 p.m. hour but doubling the net’s delivery in the timeslot last year with “Shark Tank”; best news for the show about a family who gains superpowers was its build in the second half-hour (adding about 1 million viewers). The net then won or shared the timeslot lead in key categories at 9 p.m. with the “Dancing With the Stars” results show (3.7/10 in 18-49, 16.4 million viewers overall), which was up sharply vs. last year, and dropped a bit week to week at 10 p.m. with the second week of cop drama “Detroit 1-8-7” (2.2/6 in 18-49, 9.2 million viewers overall).

ABC joined Fox in posting nice year-to-year gains on the night while CBS and NBC were on the decline.

For CBS, “NCIS” keeps humming along at 8 p.m. (4.0/11 in 18-49, 18.7 million viewers overall), matching its premiere score of the previous week and again drawing more total viewers than any other show on the night. “NCIS: Los Angeles” (3.7/10 in 18-49, 16.4 million viewers overall) followed with gains vs. its season premiere, running neck and neck with ABC’s “Dancing,” and “The Good Wife” (2.5/7 in 18-49, 12.9 million viewers overall) opened its second season by winning the 10 p.m. hour in 18-49, 25-54 and total viewers.

CBS won the night in adults 25-54 (4.6/12) and total viewers (16 million).

NBC had a sluggish night, as “The Biggest Loser” (2.7/7 in 18-49, 7.1 million viewers overall) is noticeably softer than a year ago, and “Parenthood” slipped to third among the broadcasters at 10 p.m. (2.0/6 in 18-49, 4.8 million viewers overall) — down a bit in 18-49 vs. last year’s “The Jay Leno Show.”

CW’s “One Tree Hill” (0.9/3 in 18-49, 1.8 million viewers overall) was in line with last week, while “Life Unexpected” (0.7/2 in 18-49, 1.6 million viewers overall) was up a smidge.

Preliminary 18-49 averages for the night: Fox, 4.2/12; CBS, 3.4/9; ABC, 3.0/8; NBC, 2.5/7; Univision, 1.7/5; CW, 0.9/2.

In total viewers: CBS, 16.0 million; ABC, 12.3 million; Fox, 9.7 million; NBC, 6.4 million; Univision, 4.3 million; CW, 1.7 million.