Today on TV

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.

Big Brother 10 (8 p.m., Ch. 2): The veto meeting and competition are held.

Terminator: The Sarah Connor Chronicles (8 p.m., Ch. 13): Ellison's discovery puts him in danger. (R)

Reaper (8 p.m., Ch. 30): There's a leak in hell and Sam has to find out who is responsible. (R)

P.O.V. (9 p.m., Ch. 7): The case against Chilean dictator Augusto Pinochet.