Tuesday was a good night for superhero-themed shows, as holiday specials helped provide a boost for ABC’s “Marvel’s Agents of SHIELD” while the start of a crossover storyline with “Arrow” helped CW’s “The Flash” pick up some speed.

NBC’s “The Voice” remained the night’s top series in young adults, teaming with “Chicago Fire” to put the net on top overall. CBS aired repeats of its crime dramas and easily won in total viewers.

According to preliminary national estimates from Nielsen, ABC’s premiere of the special “Toy Story That Time Forget” averaged a 1.9 rating/6 share in adults 18-49 and 6.8 million viewers overall in the 8 o’clock hour — falling well shy of the 2013 Halloween-themed “Toy Story” special (3.1 in 18-49) but good enough for a second-place demo finish in its timeslot. It was followed by the special “A Charlie Brown Christmas” (2.1/6 in 18-49, 6.8 million viewers overall), which was up a tenth from its initial airing last year.

With the specials delivering season-best 18-49 scores in the time period for ABC, “Marvel’s Agents of SHIELD” followed with its top scores (1.8/5 in 18-49, 5.3 million viewers overall) since its season premiere in September. “SHIELD,” which was up 13% from its most recent episode of two weeks ago, has its fall finale next week.

Closing the night for ABC, “Forever” (1.2/4 in 18-49, 5.2 million viewers overall) hit a nine-week high in the demo and an eight-week high in total viewers. Though the rookie drama hasn’t been doing gang-buster numbers, ABC has to be pleased that it continues to help improve a very weak year-ago timeslot.

At CW, “The Flash” (1.5/5 in 18-49, 4.2 million viewers overall) was up a bit from last week to match its top 18-49 score and deliver its largest overall audience since its second episode; it led its hour among males 12-34 (1.7/7). Since the concluding programs of a crossover event are the main beneficiaries, “Arrow” figures to see an even bigger bounce tonight.

“Supernatural” (0.9/3 in 18-49, 2.4 million viewers overall) held steady in the demos and was up a smidge in total viewers for CW at 9.

NBC opened with “The Voice” (2.6/8 in 18-49, 11.1 million viewers overall), whose live eliminations hour bounced back 0.3 from last week’s season low. The net’s comedies “Marry Me” (1.4/4 in 18-49, 5.0 million viewers overall) and “About a Boy” (1.1/3 in 18-49, 4.3 million viewers overall) rose 0.3 and 0.1, respectively, from their lows of last week when they went up against the season finale of ABC’s “Dancing With the Stars.”

“Chicago Fire” held steady at 10 (1.6/5 in 18-49, 7.3 million viewers overall) and led its timeslot among the broadcast networks.

CBS aired encores of “NCIS” (1.4/4 in 18-49, 11.5 million viewers overall), “NCIS: New Orleans” (1.4/4 in 18-49, 10.5 million viewers overall) and “Person of Interest” (1.0/3 in 18-49, 7.0 million viewers overall). “NCIS” was the night’s most-watched program overall, and “NCIS: New Orleans” nearly matched an original “Marvel’s Agents of SHIELD” in adults 25-54 (2.1 vs. 2.2).

At Fox, “MasterChef Junior” (1.6/5 in 18-49, 4.9 million viewers overall) and “New Girl” (1.4/4 in 18-49, 3.0 million viewers overall) were both up a tick while “The Mindy Project” (1.1/3 in 18-49, 2.5 million viewers overall) was about even. The comedies tied with NBC’s comedies in adults 18-49.

Preliminary 18-49 averages for the night: NBC, 1.8/5; ABC, 1.7/5; Fox, 1.4/4; CBS and Univision, 1.3/4; CW, 1.2/4; Telemundo, 0.6/2.

In total viewers: CBS, 9.7 million; NBC, 7.7 million; ABC, 5.8 million; Fox, 3.8 million; CW, 3.3 million; Univision, 3.2 million; Telemundo, 1.3 million.