Titanic's Final Mystery (8pm, Smithsonian) - A new documentary investigates a century of theories behind the sinking of the Titanic and uncovers new forensic evidence that proves the most likely theory for the disaster.
God is the Bigger Elvis (8pm, HBO) - A documentary about a famous movie star from the late 1950s and early 1960s who walks away from Hollywood at the height of her fame to become a cloistered Benedictine nun. Here's more on Dolores Hart's fascinating story.
Community (8pm, NBC) - The war between Abed and Troy intensifies, prompting Jeff to try to negotiate a truce between the former best friends while the rest of the group choose sides.
Person of Interest (9pm, CBS) - The Machine produces five numbers linked to New York's crime families, which prompts 
Reese and Finch to suspect that Elias has plans for his competition.
Scandal (10pm, ABC) - An entertaining new series in which a former White House communications director, played by Kerry Washington (right), runs a Washington, D.C., crisis-management firm. Here's my "Scandal" review.
Being Elmo (10pm, UNC-TV) - This Independent Lens documentary, narrated by Whoopi Goldberg, tells the life story of Kevin Clash, the puppeteer behind the popular Sesame Street character, Elmo. It's pretty enchanting. Adrienne has a full review.
Awake (10pm, NBC) - Michael tries to end a delicate hostage crisis and negotiates with a patient who is threatening to blow up a mental hospital. Meanwhile, his sleepless nights adversely affect his life and work.
Brooke Cain isn't always proud of the number of hours she logs in front of the TV, but her loss of brain cells can be your gain. From reality shows to sitcoms to the more serious stuff, Brooke keeps her DVR smoking so that she can help keep you in the know. Brooke also tweets for Happiness is a Warm TV (you can follow