Downton Abbey (9pm, UNC-TV) - The conclusion of the first season reveals a surprising possible heir alternative to Matthew, and Mary meddles in Edith's romantic plans. Season 2 starts next week!
Leverage (9pm, TNT) - The sting is on when Nate's high-tech squad infiltrates the cash-for-gold industry. They zero in on a crooked brother-and-sister team by leading them through an intricate treasure hunt.
Angry Boys (10pm, HBO) - Australian comedian Chris Lilley plays six characters in this mockumentary series about the lives of 21st century males, which opens on a farm with twins and a guard at a youth detention center. A second new episode airs at 10:30. Check out the "Angry Boys" trailer. (Note: A marathon of Lilley's 2008 series "Summer Heights High" begins at 6 p.m. on HBO2).
Hell on Wheels (10pm, AMC) - Elam and Cullen are assigned a mission of vengeance by Durant. Meanwhile, Lily tries to settle in at the settlement. This show just got renewed for a second season.
Finding Bigfoot (10pm, Animal Planet) - In the Season 2 premiere, the Bigfoot Field Researchers Organization team head to New York to check out reports of a baby Bigfoot based on video evidence taken in the forest.
Chef Roble & Co (10pm, Bravo) - Chef Roble presides over two overblown events in the Hamptons. One is a dog wedding and the other is a naked-statue unveiling featuring a medieval twist and a full-size pig roast.