The Sunday debut of this season’s Big Brother (1.7/6) saw the veteran reality show fall double digits from both last year’s Sunday debut and from the show’s Season 15 premiere on June 26. Last night’s one-hour BB was down 26% from its Season 14 Sunday debut on July 15, 2012 and down 23% from Wednesday’s debut. The highest-rated show of the night, Big Brother was the second most watched show on Sunday after 60 Minutes with 5.78 million viewers. A 9 PM encore of the June 24 premiere of Under The Dome (1.1/4) pulled in 5.12 million viewers making it the third most watched show of the night. Big Brother was preceded by a 60 Minutes (0.9/3) encore at 7 PM. CBS won the night in both viewers and among Adults 18-49.

Over on ABC, an America’s Funniest Home Videos encore (0.9/3) was followed by at new Celebrity Wife Swap (1.0/3) at 8 PM. The spousal reality show was down 23% from its return to the schedule last week to a series low. The second week of Whodunnit? (1.0/3) saw the new unscripted mystery series also head south by 23% among Adults 18-49 from its June 23 soft debut.

Crossing Lines (0.7/2) was the only original on NBC on Sunday. The 10 PM airing of the Euro-based crime drama held on to the results of its two-hour June 23 premiere – a result that was tied with last year’s Saving Hope as the lowest drama debut ever on a Big 4 network.

Fox was all animation encores last night. 

Deadline's Dominic Patten - tip him here.