Fox may have gained control of Tuesday and Wednesday nights with “American Idol’s” return, but NBC is standing firm on Mondays. The network won its second straight Monday while Fox saw new show “Terminator: The Sarah Connor Chronicles” continue to decline in its third outing.

NBC averaged a 4.0 rating and 10 share among adults 18-49, according to Nielsen overnights, well ahead of the other networks. Fox took second at 3.3/8.

NBC won every hour with relative ease, even 10 p.m., where the network has struggled Monday nights for the last year. “Medium” posted its best 18-49 rating since January of last year, a 3.4, and drew its top total viewers number, 10.1 million, since May 2006.

Lack of original competition likely helped the show, with CBS’s “CSI” Miami,” the usual timeslot winner, in reruns. “Medium” also had a big lead-in from “Deal or No Deal,” which topped “Connor” in the 9 p.m. timeslot for the second straight week.

“Deal” averaged a 4.4 rating, compared with a 3.6 for “Connor” and CBS’s sitcom reruns. “Connor” slipped 14 percent from a 4.2 the previous week, which was well down from a 7.7 for its premiere on Jan. 13 following the NFC divisional game.

NBC’s “American Gladiators” also slipped a bit in its fourth outing, though it still dominated its 8 p.m. timeslot. The show averaged a solid 4.3 rating, off 7 percent from the previous week’s 4.6.

Meanwhile, for the night, CBS placed third at 3.1/8, ABC fourth at 2.2/5, Univision fifth at 1.6/4 and CW sixth at 0.7/2.

At 8 p.m. NBC led with a 4.3 for “Gladiators,” followed by Fox with a 3.1 for "Prison Break.” CBS was third with a 2.7 for repeats of “How I Met Your Mother” and “Big Bang Theory,” ABC fourth with a 2.6 for the first hour of “Dance War: Bruno vs. Carrie Ann,” Univision fifth with a 2.0 for “Al Diablo con los Guapos” and CW sixth with a 0.7 for repeats of “Everybody Hates Chris” and “Aliens in America.”

NBC led again at 9 p.m. with a 4.4 for “Deal,” while Fox and CBS tied for second at 3.6, Fox for “Connor” and CBS for repeats of “Two and a Half Men” and “Rules of Engagement.” ABC was fourth with a 2.1 for the last half hour of “Dance War” and “Notes from the Underbelly,” Univision fifth with a 1.7 for “Pasion” and CW sixth with a 0.7 for repeats of “Girlfriends” and “The Game.”

At 10 p.m. NBC was on top once again, this time with a 3.4 for “Medium.” CBS was second with a 3.1 for a repeat of “CSI: Miami,” ABC third with a 1.9 for “October Road” and Univision fourth with a 1.3 for “Cristina.”

NBC also finished first for the night among households with a 6.9 average overnight rating and an 11 share. CBS was second at 6.0/9, Fox third at 5.0/7, ABC fourth at 4.9/8, Univision fifth at 2.0/3 and CW sixth at 1.2/2.