CBS's Survivor not only survived the move to Wednesday nights this season but prospered. The reality show warhorse attracted 12.47 million viewers in its season debut ( Survivor Nicaragua ), a 7 percent improvement over the 11.66 million it drew last year on Thursday night. It was also a 78-percent increase over the 7.01 million who watched the network's previous occupants of the Wednesday-night time slot a year ago, the canceled The New Adventures of Old Christine and Gary Unmarried . CBS also dominated the rest of the evening. Criminal Minds returned at 9 00 with 14.08 million viewers, followed by the series debut of The Defenders with 12.09 million. Among other newcomers, NBC's Undercovers had a so-so debut with 8.57 million and ABC's Better with You bowed with 7.97 million viewers. But ABC's The Whole Truth flopped in the 10 00 p.m. hour with just 4.91 million viewers.