Under the Dome Season 4

Ratings: Under the Dome Hits Lows

CBS’ Under the Dome on debate night drew 3.9 million total viewers and a 0.8 demo rating, slipping 17 percent and two tenths to series lows.

Opening the Eye’s line-up, an old Bang delivered Thursday’s largest audience (7.2 million viewers). Big Brother (6.2 mil/2.0) dipped a tenth week-to-week.

Elsewhere….

ABC | Astronaut Wives Club (3.6 mil/0.6) slipped two tenths in the demo, tying its season low. Mistresses (2.5 mil/0.6) and Rookie Blue (3.1 mil/0.6) each hit series lows in audience while matching their all-time demo lows.

THE CW | Beauty and the Beast (810K/0.2) was flat.

NBC | Food Fighters (3.7 mil/0.9) ticked up.

FOX | Boom! (2.3 mil/0.6) added a few eyeballs while steady in the demo.