Ratings Chart Attack!

It was a big night for CBS’ “The Big Bang Theory,” which drew its largest audience to date. ABC’s “Dancing With the Stars,” meanwhile, is winding down with a week-to-week increase but a year-on-year decline.

“Bang” posted a 3.9 rating/10 share in the 18- to 49-year-old demographic, according to preliminary Nielsen Media Research data, tying its series high. “Bang” also reeled in 10.2 million viewers.

“How I Met Your Mother” (4.3/11, 10 million), “Two and a Half Men” (5.3/12, 14.9 million) and “Worst Week” (3.3/8, 10.4 million) stayed consistent with last week’s draw, which is on the high side of their season averages.

“CSI: Miami” (3.9/10, 14.1 million) declined 7% in adults 18-49 from last week.

CBS won its third straight Monday in 18-49 with a 4.1/10 nightly average; it was second in viewers with 12.3 million.

On ABC, “Dancing” rolled out its last performance show of the year to a 4.8/12 and 21.3 million viewers. The show, while increasing 13% week-to-week in adults 18-49, was down 21% compared with last year’s final performance show.

“Samantha Who?” (3.2/8, 11.9 million) also climbed 14% from last week, hitting its highest performance since last year’s season finale. But overrun from “Stars” may affect “Samantha” once final data is released later today.

“Boston Legal” (2.3/6, 8.7 million) grew 10% from last week for its best showing since its September premiere.

ABC placed first in viewers with 15.5 million and second in adults 18-49 with a 3.7/9.

NBC’s “Chuck” (2.5/6, 6.6 million) stayed on par with last week’s data, while “Heroes” (3.6/9, 7.8 million) continues to stay in a holding pattern with its series low. “My Own Worst Enemy” (1.9/5, 4.2 million) improved one-tenth of a ratings point from last week. NBC took third with a 2.7/7.

Fox took fourth with a 1.9/5, with both “Terminator: The Sarah Connor Chronicles” (1.8/5, 4.6 million) and “Prison Break” (2.1/5, 5.2 million) dipping a tenth of a ratings point from last week.

The CW was fifth with a 0.8/2. “One Tree Hill” (1.0/2, 2.2 million) lost a large amount of ground in The CW’s key demographic of women 18-34 without a “Gossip Girl” lead-in, dipping 36% week-to-week to a 2.1/5.