The Ellen DeGeneres Show
(3 p.m., NBC10) - Mariah Carey; 6-year-old solar system expert Brandt Bickford.
Oprah Winfrey (4 p.m., 6ABC) - Moms get sexy makeovers.
Greek (8 p.m., FAM) - Frannie lodges a complaint against Ashleigh for alleged homecoming float sabotage. Dale and Calvin each make a "purity pledge" to fight off sexual temptations.
How I Met Your Mother (8:30 p.m., CBS3) - Robin rediscovers the "Woo Girls," a group of single women who like to party.
Two and a Half Men (9 p.m., CBS3) - Evelyn offers to pay for Jake's college education.
Intervention (9 p.m., A&E) - Donald, a gifted boxer who chose drugs over his career, faces the cost of addiction in his family life as well.
America at a Crossroads (10 p.m., WHYY TV12) - "Mosque in Morgantown." Journalist and activist Asra Nomani returns to her home in West Virginia and finds that the mosque where she had worshipped in childhood has been taken over by men she considered extremists.
Late Show With David Letterman (11:35 p.m., CBS3) - Jack Black; Dr. M.A. Sanjayan.
The Tonight Show With Conan O'Brien (11:35 p.m., NBC10) - L.A. Dodgers manager Joe Torre; Spinal Tap performs.
Jimmy Kimmel Live (12:06 a.m., 6ABC) - David Spade; Zoe Saldana; Black Eyed Peas perform.
The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Holly Hunter; Camera Obscura performs.
Late Night With Jimmy Fallon (12:37 a.m., NBC10) - Matthew Broderick; professional hockey player Sean Avery; Jason Aldean performs.