Oprah Winfrey (4 p.m., 6ABC) - Actors January Jones and Jon Hamm (Mad Men).

Dancing With the Stars (8 p.m., 6ABC) - The ninth-season lineup of "stars" includes former teenage sitcom witch Melissa Joan Hart, Donny Osmond and former U.S. Rep. Tom DeLay.

House (8 p.m., Fox29) - Last season, House checked into a psychiatric hospital, which is where we find him in the two-hour episode that opens season six. Andre Braugher (Homicide: Life on the Street) is House's psychiatrist.

Accidentally on Purpose (8:30 p.m., CBS3) - Jenna Elfman (Dharma & Greg) returns to series television as Billie, an impetuous film critic who, after an unsettling encounter with her old flame and boss (Grant Show), embarks on a passionate one-night stand with a much younger man (Jon Foster) that leaves her pregnant.

Two and a Half Men (9 p.m., CBS3) - It's a certainty that things aren't going to go well when Charlie is forced to decide between fiancee Chelsea and Mia, the one who got away. Charlie Sheen and Jon Cryer star in the seventh-season premiere.

Late Show With David Letterman (11:35 p.m., CBS3) - President Obama.

The Tonight Show With Conan O'Brien (11:35 p.m., NBC10) - Actor Ricky Gervais; "Chicken" Charlie Boghosian; Lynyrd Skynyrd performs.

Jimmy Kimmel Live (12:05 a.m., 6ABC) - Actor Robin Williams; director Bobcat Goldthwait; Matt & Kim perform.

The Late Late Show With Craig Ferguson (12:35 a.m., CBS3) - Actress Marg Helgenberger; actor Dule Hill.