Today on TV

• Survivor (7 p.m., Ch. 2): The number of remaining contestants is reduced from five to four.

• American Inventor (7 and 8 p.m., Ch. 4): Each hour ends with an inventor being sent to the finals of this competition.

• Will & Grace (7 p.m., Ch. 5): With Vince back in his life, Will doesn't have as much time for Grace and her pregnancy.

• That '70s Show (7 and 7:30 p.m., Ch. 13): "Brady Bunch" alumni Barry Williams and Christopher Knight guest star as a gay couple who move in next door; Jackie confesses to Fez that she has feelings for him.

• Smallville (7 p.m., Ch. 30): Clark is visited by his father's ghost, who tells him to kill Lionel.

• My Name Is Earl (7:30 and 8 p.m., Ch. 5): Earl tries to redeem himself for stealing gas and for shooting a girl with a BB gun.

• CSI (9 p.m., Ch. 2): A high roller is murdered.

• The O.C. (8 p.m., Ch. 13): Sandy is chosen as Newport's man of the year.

• Supernatural (8 p.m., Ch. 30): Sam and Dean must rescue their father from Meg's clutches. (Season finale)

• The Office (8:30 p.m., Ch. 5): Michael takes over conflict-resolution duties at work.

• Without a Trace (7 p.m., Ch. 2): A widower and his two kids disappear.

• Commander in Chief (9 p.m., Ch. 4): Mac's appendix bursts, which leaves Templeton temporarily in charge.

• ER (8:59 p.m., Ch. 5): In Darfur, Pratt is overwhelmed by all the people needing help.