On a night that produced mostly lackluster results elsewhere, CW’s “Arrow” was on the mark Wednesday with the conclusion of its crossover storyline with “The Flash” — surging week to week and hitting a series-high demo score.

According to preliminary national estimates from Nielsen, “Arrow” averaged a series-best 1.4 rating/4 share in adults 18-49 while drawing its second largest overall audience ever (3.9 million). Week to week, “Arrow” soared by roughly 50% in most key demos as well as total viewers. (One night earlier, “Flash” had one of its best perfs in a while, earning a 1.6/5 in 18-49 and 4.34 million viewers overall).

In the 8 o’clock hour with “Arrow,” CW ranked No. 1 among men 18-34 (1.5/6) and No. 2 in adults 18-34 (1.2/4) and men 18-49 (1.7/6).

At 9 p.m., “The 100” (0.6/2 in 18-49, 1.9 million) held steady in demos while gaining 18% in total viewers. And overall, this was the CW’s most-watched Wednesday in two years.

Elsewhere, it was a tight battle for first among adults 18-49, with NBC finishing in a preliminary tie with CBS thanks to holiday specials “Christmas in Rockefeller Center” (1.9/6 in 18-49, 9.4 million viewers overall) and the two-hour “Saturday Night Live Christmas” (1.9/6 in 18-49, 6.2 million viewers overall). Though solid numbers, the same specials on the comparable night a year ago averaged a considerably stronger 2.5 in 18-49.

CBS rested “Criminal Minds” and went with a two-hour “Survivor” (2.1/6 in 18-49, 8.6 million viewers overall), which was on the low end of its season range but led its two-hour block in most categories. And at 10 p.m., without a drama lead-in for the first time, “Stalker” (1.5/5 in 18-49, 7.5 million viewers overall) was in line with its recent average.

ABC’s comedies, which aired repeats on Thanksgiving Eve, sagged in their return last night.”The Middle” (1.6/5 in 18-49, 7.2 million viewers overall), “The Goldbergs” (1.7/5 in 18-49, 6.6 million viewers overall), “Modern Family” (2.8/8 in 18-49, 9.0 million viewers overall) and “Black-ish” (2.1/6 in 18-49, 6.9 million viewers overall) all had easily their lowest scores of the season. On the plus side, “Modern” remained Wednesday’s No. 1 series in 18-49, and the retention for rookie lead-out “Black-ish” remained solid.

“Nashville” closed things out for ABC (1.3/4 in 18-49, 5.3 million viewers overall), matching its season low.

Fox’s “Hell’s Kitchen” (1.2/4 in 18-49, 3.6 million viewers overall) and “Red Band Society (0.9/3 in 18-49, 3.1 million viewers overall) both edged up from their week-ago pre-holiday scores but the net finished a distant fourth among the major networks.

Preliminary 18-49 averages for the night: CBS and NBC, 1.9/6; ABC, 1.8/5; Univision, 1.2/4; Fox, 1.1/3; CW, 1.0/3; Telemundo, 0.6/2.

In total viewers: CBS, 8.3 million; NBC, 7.2 million; ABC, 6.7 million; Fox, 3.3 million; Univision, 2.9 million; Telemundo, 1.4 million.