Following its surprisingly strong debut against Game 7 of the World Series last week, NBC’s new fairytale-themed drama Grimm (1.8/5 in 18-49, 5.92 million viewers) dropped a modest 14% in its second airing. It won the 9 PM hour in the demo and ranked as the second-highest-rated program of the night behind the CBS drama Blue Bloods. Things looked much gloomier for NBC’s departing dramedy Chuck (0.8/3, 3.1 million), which was the lowest-rated and least-watched program on the Big 4 — down 20% in the demo from its season premiere last week for a new series low. Dateline (1.2/4, 4.1 million) closed out the night for NBC, down a tenth from last week.

Grimm seems to be hurting CSI: NY in the 9 PM slot. The veteran CBS crime drama (1.6/5, 9.7 million) was down 11% in 18-49 from its last original two weeks ago. Blue Bloods (2.1/6, 12.6 million) posted season highs, up a big 24% from the fast national for its last original. (Blue Bloods is usually adjusted up in the finals.) This was the cop family drama’s second-best 18-49 and total viewer result behind the series’ September 2010 premiere. Blue Bloods was the top program Friday and helped CBS (1.6/5, 10.2 million) win the night despite another soft outing by rookie A Gifted Man (1.2/4, even, 8.4 million), which didn’t make a strong case for a back order. (But it may get a partial one anyway.)

Fox’s Kitchen Nightmares (1.5/5) and Fringe (1.3/4) were both up a tenth from their most recent episodes. ABC’s Extreme Makeover: Home Edition rebounded from having to face the conclusion of the World Series last week; the 8 PM episode (1.2/4) was up 20%, the 9 PM one (1.4/4) was up 27%. At 10 PM, 20/20 (1.1/3) was down a tenth. The CW’s Nikita and Supernatural held steady.