The return of Big Brother on CBS Wednesday night helped lift the network to No. 1 in the ratings even though NBC had the top-rated show of the night, America's Got Talent , with 11 million viewers. Big Brother , although No. 1 in the 8 00 p.m. time period, attracted 7.25 million viewers. While a solid figure, particularly for a summer rerun show, it was not the network's top-rated show for the night. That honor went to a repeat of Csi Crime Scene Investigation , which is now permanently settling in to its new location on Wednesday nights. Wednesday's repeat attracted 7.30 million viewers. On Fox, a two-hour version of So You Think You Can Dance placed third in the ratings with an average 5.46 million viewers.