By James Hibberd
November 01, 2011 at 04:06 PM EDT

Fox’s Terra Nova ratings got spooked on Halloween night, falling more than any other broadcast show after spending a week off the air due to baseball coverage.

Terra Nova returned to 6.4 million viewers and a 2.1 adults 18-49 rating, down 25 percent compared to its last original airing. (Bummer — some say it was the show’s best episode, recap here.) Given that Terra Nova airs at 8 p.m. and is targeted toward families, it was probably the most likely series to take a punch.

And Terra Nova wasn’t the only show to take a holiday night hit in the ratings — pretty much every series was down, except…

ABC’s Castle (12.9 million, 2.9) which shot up 21 percent from last week. Perhaps it was helped a bit by NBC switching from Prime Suspect repeats to the series premiere of its new show, Rock Center with Brian Williams (4.1 million, 1.0). Rock Center came in lower than NBC’s fall average in the slot.

CBS won the night and at least got into the holiday spirit with Halloween-themed episodes. Still, that didn’t stop the lineup from dipping slightly across the board, with Two and a Half Men (13.8 million, 4.7) taking the biggest hit, down 15 percent. CBS also aired How I Met Your Mother (10.7 million, 4.3), 2 Broke Girls (11.1 million, 4.2), Mike & Molly (11.5 million, 3.8), and Hawaii Five-0 (10.3 million, 2.9).

Also Monday: Dancing With the Stars (16.3 million, 2.8) dipped 13 percent to a series low for a performance show. NBC’s The Sing-Off (4.4 million, 1.4) hit a low. Fox’s House (6.5 million, 2.5) fell 19 percent.

Read more:

‘Terra Nova’ recap: Crime and Prehistoric Punishment

‘Rock Center with Brian Williams’ premiere review: ‘Birth tourism’ and man-camps

‘Two and a Half Men’: Motherlover

‘How I Met Your Mother’ recap: It’s the Great (Slutty) Pumpkin, Ted Mosby

‘Dancing With the Stars’ recap: The Monster Ballroom