Today on TV

Summer Olympics: NBC (Ch. 5) has coverage from 10 a.m.-1 p.m., 7 p.m.-midnight and 12:35-1:30 a.m.; CNBC from 3-6 p.m. and 10 p.m.-2:30 a.m.; 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 (7 p.m., Ch. 2): Another houseguest is evicted.

Supernatural (8 p.m., Ch. 30): Sam and Dean find themselves in the middle of a ghost-hunter reality show while chasing a ghost. (R)

Flashpoint (9 p.m., Ch. 2): Teen gang members are seeking revenge.

Kathy Griffin: My Life on the D-List (11 p.m., Bravo): Kathy visits wounded troops in the season finale.

Burn Notice (11 p.m., USA): Michael tries to catch an embezzler.