Southland | 10pm on NBC

An unidentified woman is found dead in an alley; Nate’s little sister goes missing and secrets from his past are revealed.

The Unusuals | 10pm on ABC

Cole gets a disturbing call from Frank Lutz; Delahoy and Banks investigate a series of bank robberies.

In Treatment | 9 & 9:30pm on HBO

9pm: Mia Week Two: Mia admits that she tried to impress Paul by flaunting her job and her relationship with a married co-worker. 9:30pm: April Week Two: April details her detachment from a former boyfriend and his current partner.

Armageddon | 10pm on Encore

An asteroid is on a direct collision course with Earth and will likely wipe out all life on the planet. NASA recruits maverick oil drillers destroy it.

Harper’s Island | 10pm on CBS

Series Premiere: Seven years after her mother and five others were murdered on Harper’s Island, Abby Mills returns for the wedding of her best friend, but a week of celebration turns to a fight for survival as people start dying.

P.S. I Love You | 9pm on MoreMax

A grieving widow receives a series of messages that her husband left to encourage her to establish a new life and ease the loss. Based on the novel by Cecilia Ahern. Hilary Swank, Gerard Butler, Lisa Kudrow, Gina Gershon, James Marsters

Jim Gaffigan: King Baby | 9pm on Comedy Central

MY BOYS star and stand up comedian Jim Gaffigan takes to the stage in his latest special. In it, he makes fun of himself and talks about bowling, laziness, camping, bacon, recycling, ketchup, regional food, and the Bible.

The Notebook | 8pm & 10:30pm on Oxygen

A man tells a story to a woman about two young people who become lovers in 1940s North Carolina. Based on a book by Nicholas Sparks.

Brothers & Sisters | 10pm on ABC

Trying to help before Tommy’s legal troubles get any worse, Nora seeks help from the person Tommy hurt the most; Ryan gets a little too close to Rebecca for Justin’s comfort

Xanadu | 10:30pm on ABC Family

A mythological muse helps an artist and a former big-band clarinetist open a roller disco. Olivia Newton-John, Gene Kelly, Michael Beck, James Sloyan, Dimitra Arliss.

Charlie Wilson’s War | 8pm on Cinemax

A congressman, a socialite and a CIA agent are instrumental to the funding of freedom fighters working against the Soviet invasion of Afghanistan. Based on a book by George Crile.

Life on Mars | 10pm on ABC

Student radicals target the police with bomb threats; Sam, Tyler, Annie and Hunt discover mysterious connections to a student and a political science professor.

18 KIDS & COUNTING | 9pm on TLC

The Duggars travel to the San Antonio Independent Christian Film Festival to watch movies and meet their favorite star, Kirk Cameron.

Flight of the Conchords | 10pm on HBO

Murray arranges a presidential meeting for the visiting Prime Minister of New Zealand; Jemaine gets mixed up with an Art Garfunkel fanatic.

Heroes | 9pm on NBC

Matt holds H.R.G hostage and forces him to reveal how he got involved with Nathan’s plot to capture people with abilities; Matt’s findings bring Peter face-to-face with the Hunter.