NBC dominated the final Tuesday of March behind “The Voice” and the first originals in weeks for “Chicago Med” and “Chicago Fire,” while CW’s “The Flash” bounced back from last week’s lower-than-usual numbers one night after its special appearance on “Supergirl.” And over at CBS, James Corden’s primetime “Carpool Karaoke” special helped bring more exposure to his “Late Late Show.”

According to preliminary national estimates from Nielsen, “The Voice” was the top show of the night, averaging a 2.3 rating/8 share in adults 18-49 and 10.3 million viewers overall in the 8 o’clock hour. It was down 0.1 from last week’s prelim score and 0.2 below its 2.5 in the official nationals.

Back after four weeks off, “Chicago Med” (1.8/6 in 18-49, 8.6 million viewers overall) outpeformed its prior six 2016 airings in the timeslot (without a lead-in from “The Voice”) but was down some from its early weeks last November and December when the music competition series led into it. And closing the night, “Chicago Fire” (1.8/6 in 18-49, 8.7 million viewers overall), also back in originals after four weeks, matched its 2016 high and dominated its hour opposite unscripted programming on both ABC and CBS.

CW’s “The Flash” (1.3/5 in 18-49, 3.3 million viewers overall) was up 0.2 from last week’s season low, placing second to only NBC’s “The Voice” for the hour in 18-49 and a dominant No. 1 among men 18-34 (1.4/7). A special appearance by the title character on CBS’ “Supergirl” the previous night seemed to help bring more awareness to the second-year CW show, though its audience profile was similar to prior episodes, with about half of its total viewership comprised of adults 18-49.

“Flash” was followed by “iZombie” (0.5/2 in 18-49, 1.3 million viewers overall), which held at last week’s 18-49 rating while edging up in total viewers and adults 18-34 (0.5/2).

At CBS, repeats of “NCIS” (1.2/4 in 18-49, 10.3 million viewers overall) and “NCIS: New Orleans” (1.2/4 in 18-49, 8.8 million viewers overall) were followed by “The Late Late Show Carpool Karaoke” (0.9/3 in 18-49, 4.3 million viewers overall), which placed second among the major networks at 10. The special, which featured a new Carpool Karaoke installment with Jennifer Lopez and highlights from previous segments, drew the second largest audience to date for Corden — behind only his special post-Super Bowl “Late Late Show” episode in February (4.93 million).

ABC was mostly steady, with “Fresh Off the Boat” (1.2/5 in 18-49, 4.6 million viewers overall) and “The Real O’Neals” (1.0/4 in 18-49, 3.8 million viewers overall) matching their scores of last week and “Marvel’s Agents of SHIELD” (1.0/3 in 18-49, 3.2 million viewers overall) up a tick from last week’s season low. The Tuesday-at-10 hour continues to be a black hole for the net, though, as “Beyond the Tank” remained at its ugly level of last week (0.6/2 in 18-49, 2.2 million viewers overall).

Fox had another Tuesday night mixed with original and repeats of its low-rated comedies. A first-run “New Girl” hit a season low leading off the night (0.9/3 in 18-49, 2.2 million viewers overall), and was followed by a repeat “Grandfathered” (0.5/2 in 18-49, 1.3 million viewers overall), a new “Brooklyn Nine-Nine” (0.8/3 in 18-49, 2.0 million viewers overall) and an encore “The Grinder” (0.4/1 in 18-49, 1.3 million viewers overall).