Summer Olympics: NBC (Ch. 5) has coverage from 10 a.m.-1 p.m., 7-11 p.m. and 11:35 p.m.-1 a.m.; CNBC from 3-6 p.m. and 10 p.m.-midnight; MSNBC from 7 a.m.-3 p.m. and 3-7 a.m.; Oxygen from 7-9 p.m.; and USA from 7-10 a.m., and midnight-7 a.m.

Greatest American Dog (7 p.m., Ch. 2): The canine competition continues.

Nova scienceNOW (8 p.m., Ch. 2): A possible cancer cure; proteins inside dinosaur bones.

Terminator: The Sarah Connor Chronicles (8 p.m., Ch. 13): Sarah gets too close to a Terminator. (R)

Family Foreman (11 p.m., Nick): In the first-season finale, Big George decides that it's time to take a step back and spend some quality time with his wife.