Ratings: Halloween Is Only a Treat for Castle; All Others Got Rocks (or Rock Center)

On a night tricked by depressed Halloween viewership, Castle was the only program to notch an increase in the coveted 18-49 demo. Drawing just shy of 13 million total viewers whole scoring a 2.9 demo rating, the ABC drama copped gains of 20 percent.

Most everyone else, though, got rocks in their pillowcase. See:

* Dancing With the Stars averaged 16.3 million total viewers and a 2.8 rating, down 12 percent in the demo to an all-time low for a performance show. NBC’s The Sing-Off (4.4 mil/1.4) upticked 5 percent to its best audience in four weeks, yet dipped 7 percent to an all-time low rating. (If only to rile people, I pass along a rival network’s observation that The Sing-Off is averaging 27 percent lower numbers than Chuck/The Event delivered a year ago. Consider yourself riled!)

* Onto the CBS sitcoms, How I Met Your Mother (10.7 mil/4.1) and 2 Broke Girls (11.1 mil/4.2) both slipped 7 percent in the demo, Two and a Half Men (13.8 mil/4.7) tumbled 15 percent, and Mike & Molly (11.53 mil/3.8) was down 10 percent.

* The Fox dramas, back from their baseball hiatus, took pretty much the biggest hits on Monday. Terra Nova, at 6.4 mil and a 2.1, dropped some 22 percent, while House (6.55 mil/2.5) was down about 20 percent.

* Trailing far, far behind Castle and Hawaii Five-0 (10.3 mil/2.9, down 6 percent), NBC’s Rock Center newsmagazine premiered to 4.1 million total viewers and a 1.0 rating — improving on The Playboy Club‘s final audience but down 17 percent versus Amber Heard’s comparatively bodacious demo.

What were you watching on Monday as you consumed “fun size” Baby Ruths?