Get ready for more crossovers after another successful one, between the CW’s The Flash and Arrow, the second in a month following the strong delivery for the one involving Dick Wolf’s NBC dramas. The conclusion of The Flash-Arrow crossover brought record ratings for Arrow as the superhero drama posted its highest adults 18-49 Live+Same Day ever last night, 1.4, up a whopping +56% from its last original, and its second largest audience (3.86 million, up +46%) behind only the series premiere. Arrow also matched its high in adults 18-34 (+50%). The major ratings tide did not carry over to The 100 (1.94 million, 0.6), which was even in 18-49, up +18% in total viewers.

ABC’s lineup suffered from a post-holiday hangover. After posting across-the-board gains with their mostly Thanksgiving-themed episodes two weeks ago, all ABC Wednesday programs were down last night to set or tie lows. The Middle (1.6) was down -16%, matching a series Live+SD low. The Goldbergs (1.7, -29%) and Modern Family (2.8, -24%) logged season lows though Modern Family regularly gets adjusted up in the finals. Black-ish (2.1, -19%) posted a series low, while Nashville (1.3, down -13%) tied a season low.

While TV usage among 18-49 was up by +12% from last Wednesday, Thanksgiving eve, CBS’ two-hour Survivor (2.1) last night was even with its hourlong episode last week, which was a series low in Live+SD. After an uptick on Thanksgiving eve, Stalker (1.5) was down a tenth.

Fox’s lineup rose with the rise in 18-49 usage. Hell’s Kitchen (1.2) was up +9% from last Wednesday; Red Band Society (0.9) was up +29%.

The extra last-minute publicity for NBC’s annual Christmas In Rockefeller Center special from Mariah Carey’s botched performance did not help as the telecast (1.9) was down -17% from last year when Carey again was part of the lineup. (But she did not have to pull off a fully live performance after showing up three hours late for the taping as she did this year.) NBC kept the theme with a two-hour Saturday Night Live Christmas special (1.9), which helped it tie CBS for No. 1 on the night among adults 18-49, while ABC (1.8) had to settle for third despite featuring the top program of the night in the demo by a wide margin, Modern Family.