It was another sluggish Sunday for the broadcast networks, as CBS reality vet “Big Brother” was the only program to make much ratings noise. Fox led among young adults thanks to repeats of its comedies, while the Eye net prevailed in total viewers.

According to preliminary nationals from Nielsen, “Big Brother” ruled across the board during the 8 o’clock hour (2.3/8 in 18-49, 7.0 million viewers overall), building sharply in demos on its “60 Minutes” lead-in (0.9/3 in 18-49, 7.6 million viewers overall) and standing as the evening’s top show among young adults. The net didn’t do much the rest of the way with repeats of crime dramas “CSI” (1.0/3 in 18-49, 5.0 million viewers overall) and “Cold Case” (1.1/3 in 18-49, 5.8 million viewers overall).

At Fox, things started slowly with a burn-off original episode of “Sons of Tucson” (0.6/2 in 18-49, 1.5 million viewers overall) and a repeat of “American Dad” (1.5/5 in 18-49, 3.6 million viewers overall), but then picked up with encores of “The Simpsons” (1.5/5 in 18-49, 3.6 million viewers overall) and “The Cleveland Show” (1.7/5 in 18-49, 3.8 million viewers overall). And the net’s best numbers came from 9 to 10 with a pair of “Family Guy” repeats that averaged a 2.0/6 in 18-49 and 4.3 million viewers overall, winning among the broadcasters in key under-50 demos.

NBC opened with “Dateline” (1.0/4 in 18-49, 4.5 million viewers overall), which narrowly edged out “60 Minutes” among the 18-49 crowd, and then earned a modest 0.8/3 in the demo and 4.5 million viewers overall from 8 to 9 p.m. with “Law & Order: Criminal Intent” (0.8/3 in 18-49, 4.5 million viewers overall). Things picked up in the second half of the night, as auds always seem to flock to rebroadcasts of “America’s Got Talent” (1.4/4 in 18-49, 4.7 million viewers overall).

ABC’s scripted originals “Scoundrels” (0.7/2 in 18-49, 3.2 million viewers overall) and “The Gates” (0.9/3 in 18-49, 3.0 million viewers overall) dipped from their already anemic ratings levels and again lagged well behind the repeat competition on the other major networks. The Alphabet fared better earlier in the evening with encores of its reality series “America’s Funniest Home Videos” (1.4/5 in 18-49, 5.7 million viewers overall) and “Extreme Makeover: Home Edition” (1.1/4 in 18-49, 4.5 million viewers overall).

Preliminary 18-49 averages for the night: Fox, 1.5/5; CBS, 1.3/4; NBC, 1.1/4; ABC, 1.0/3; Univision, 0.6/2.

In total viewers: CBS, 6.4 million; NBC, 4.6 million; ABC, 4.1 million; Fox, 3.3 million; Univision, 1.6 million.