The Ellen DeGeneres Show

(3-4 p.m., NBC10) - Actor Mike Myers (

The Love Guru

); Josh Groban performs; DeAnna Pappas (

The Bachelorette

).

Oprah Winfrey

(4-5 p.m., 6ABC) - Dr. Oz helps guests conquer obsessive-compulsive disorder.

Depression: Out of the Shadows

(9-11 p.m., WHYY TV12) - It affects tens of millions of lives - the more than 18 million people who have it and those who love them and work with them. This new documentary sheds light on the much-misunderstood disorder known as depression in its many forms, reiterating that it's a real illness, not a sign of weakness or a character flaw. People with the disorder tell their stories, and scientists discuss present and future treatments.

Boston Legal

(10-11 p.m., 6ABC) - Concord, Mass., cradle of the American Revolution, wants to secede from the United States? If you find that shocking, you're not alone. Denny (William Shatner) is appalled - and even more so when he finds out that Alan (James Spader) is representing the secessionists. He signs on with the other side, and the two friends face off in court - which puts a damper on their celebration of their acceptance into the Auxiliary Coast Guard, in the season finale.

Late Show With David Letterman

(11:35 p.m.-12:35 a.m., CBS3) - Actress Kristin Davis; Jimmy Buffett performs.

The Tonight Show With Jay Leno

(11:35 p.m.-12:35 a.m., NBC10) - Actor Adam Sandler; singer-actress Hilary Duff; Al Green performs.

Jimmy Kimmel Live

(12:05-1:05 a.m., 6ABC) - Singer Josh Groban; tattoo artist Kat Von D; the Kooks perform.

The Late Late Show With Craig Ferguson

(12:35-1:35 a.m., CBS3) - Singer k.d. lang.

Late Night With Conan O'Brien

(12:35-1:35 a.m., NBC10) - Actor Harrison Ford; actor Eric McCormack; Atmosphere performs.