Oprah Winfrey (4 p.m., 6ABC) - Karaoke singers perform live in front of a panel of judges.

FlashForward (8 p.m., 6ABC) - A British intelligence agent helps investigate a Blue Hand club that may be connected to some recent suicides.

The Vampire Diaries (8 p.m., CW57) - Stefan gets a visit from an old friend, Lexi, who also offers some relationship advice to Elena.

Parks and Recreation (8:30 p.m., NBC10) - Leslie is distressed to find out another department is trying to take over her lot.

Supernatural (9 p.m., CW57) - Sam and Dean are sent to an alternate universe where they become characters on different TV series.

The Mentalist (10 p.m., CBS3) - Our favorite master of mind games is placed under arrest but its still able to help the CBI solve a young man's murder.

The Jay Leno Show (10 p.m., NBC10) - Wanda Sykes; Rachael Ray; Dan Finnerty and the Dan Band.

Late Show With David Letterman (11:35 p.m., CBS3) - Bill Maher; Gabourey "Gabby" Sidibe; Keith Urban performs.

The Tonight Show With Conan O'Brien (11:35 p.m., NBC10) - Jim Carrey; Olivia Wilde; Zac Brown Band performs.

Jimmy Kimmel Live (12:06 a.m., 6ABC) - Jesse Williams; Florence and the Machine perform.

The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Denis Leary; Jena Malone.

Late Night With Jimmy Fallon (12:37 a.m., NBC10) - Ian McKellen; Paula Patton; Yoko Ono and Sean Lennon perform.