On a night when the top CBS shows aired in repeat, Fox emerged victorious in key demos behind top show “House” and steady rookie “The Chicago Code.” Meanwhile, the return of NBC’s “The Event” was hardly one as it finished well behind it major-network competition.

According to preliminary nationals from Nielsen, “House” was in control of Monday’s opening hour (3.8 rating/11 share in adults 18-49, 11.1 million viewers overall) and ruled as the evening’s top program in both demos and total viewers. It was followed by “The Chicago Code” (2.1/6 in 18-49, 7.5 million viewers overall), which has settled into a solid but unspectacular ratings performer. Both dramas were flat week to week.

NBC struggled to get auds enthused about “The Event,” whose two-hour return episode averaged a 1.4/4 in 18-49 and 5.2 million viewers overall — down about 25% from its last original episode in late November. The net then picked up some at 10 p.m. with “Harry’s Law” (1.8/5 in 18-49, 9.4 million viewers overall), which took advantage of repeat dramas on ABC and CBS to draw its largest overall audience in five weeks.

ABC ran second on the night with its combo of “The Bachelor: The Women Tell All” (3.1/9 in 18-49, 9.9 million viewers overall) and a repeat of “Castle” (1.4/4 in 18-49, 5.7 million viewers overall).

And at CBS, recent addition “Mad Love” (2.4/7 in 18-49, 7.3 million viewers overall) was on the decline but earned some points by building on its repeat “How I Met Your Mother” lead-in (2.0/6 in 18-49, 6.4 million viewers overall). It was followed by encores of “Two and a Half Men” (2.8/8 in 18-49, 10.2 million viewers overall), “Mike and Molly” (2.6/7 in 18-49, 9.3 million viewers overall) and “Hawaii Five-0” (2.0/6 in 18-49, 7.6 million viewers overall). “Men” led its half-hour in total viewers, and “Hawaii” was the broadcast leader in 18-49 for its hour.

CW was back in repeat mode with “90210” (0.2/1 in 18-49, 0.7 million viewers overall) and “Gossip Girl” (0.2/1 in 18-49, 0.5 million viewers overall).

Preliminary 18-49 averages for the night: Fox, 2.9/8; ABC, 2.5/7; CBS, 2.3/6; NBC and Univision, 1.5/4; CW, 0.2/1.

In total viewers: Fox, 9.3 million; ABC, 8.5 million; CBS, 8.1 million; NBC, 6.6 million; Univision, 4.1 million; CW, 0.6 million.