By James Hibberd
Updated October 01, 2012 at 03:24 PM EDT
Credit: Jack Rowand/ABC

ABC’s Sunday drama block launched to strong ratings overall, but newcomer 666 Park Ave. opened surprisingly weak.

The season two return of Once Upon a Time (11 million viewers, 3.8 adults 18-49 demo) was last night’s top-rated entertainment show and returned down only 5 percent from last year’s high flying series premiere. (See our interview with the Once Upon showrunners about last night’s episode).

Revenge (9.5 million, 3.2), in its new time period, did well too — down a mere tenth of a point from its Wednesday night series debut last fall and tying last year’s Desperate Housewives premiere in this slot. This rating is firmly better than the second half of Revenge‘s season, suggesting the move to Sunday paid off. Airing against CBS’ Good Wife (9.8 million, 1.8), which declined 18 percent, Revenge firmly got the upper hand in the adult demo.

And then there was 666 Park Ave (7 million, 2.2), which was tracking to have a strong opening. The Terry O’Quinn supernatural drama was down 29 percent from the premiere of Pan Am in this slot last year (and that’s with a minute of overrun from Revenge, too). Park Ave. was competitive against CBS’ The Mentalist (10.8 million, 2.1), which moved from its long time Thursday home to Sunday, and dropping 25 percent in the process. CBS also had the return of The Amazing Race (9.7 million, 2.5), down 17 percent.

The dramas faced off against NBC’s powerful Sunday Night Football and Fox’s popular animated block. The most notable of the ‘toon news was that the normally indestructible Family Guy (6.5 million, 3.3) was down 20 percent. Fox also had Simpsons (8 million, 3.7), Bob’s Burgers (5.4 million, 2.5) and American Dad (5.2 million, 2.5).