Highlights: February 5-11

Masterpiece Classic at 7 pm Sunday presents part four of Downton Abbey, Series II. In the climactic battle of the war, Matthew and William go over the top to an uncertain fate. Vera plays a cruel endgame with Bates and Anna, and Daisy faces the severest test of her life.

Masterpiece Classic at 8 pm Sunday and 8 pm Saturday presents part five of Downton Abbey, Series II. As the war nears its end, Downton’s aristocrats and servants put their lives back together. Mary and Sir Richard go estate hunting, while a mysterious wounded officer makes a shocking revelation.

When two murders share a link with their own Doctor Hobson, Lewis and Hathaway try to clear her name by unraveling the truth from a tangle of complicated events on Masterpiece Mystery!: Inspector Lewis, Series III at 9 pm Sunday.

Underground Railroad: The William Still Story at 9 pm Monday details one of the most important yet unheralded individuals of the Underground Railroad along with the accounts of black abolitionists, who had everything at stake as they helped fugitives follow the North Star to Canada.

Up From the Bottoms: The Search for the American Dream at 10 pm Monday tells the story of the massive migration of African Americans from the rural south to the prosperous north during the World War II years and beyond.

Freedom Riders: American Experience at 7 pm Tuesday chronicles a chapter of American history that stands as an astonishing testament to the accomplishment of youth as an integrated band of college students risk their lives to battle segregation in the 1960s.

Frontline at 9 pm Tuesday cuts through the fog of war to reveal the untold story of what happened in Haditha, Iraq, where 24 of the town’s residents were killed by U.S. forces in what many in the media branded “Iraq’s My Lai.”

On Nature at 7 pm Wednesday, scientists from around the world share their thoughts and work to help explore the scientific theory that in an effort to outwit raccoons, we are actually making them smarter and unwittingly contributing to their evolutionary success.

Nova at 8 pm Wednesday takes a glimpse into the lives of Trishna and Krishna, twin girls born joined at the head who are ready for a series of delicate operations that will prepare them for the ultimate challenge: a marathon separation surgery that will allow them to live truly separate lives.

On Inside Nature’s Giants: Big Cats at 9 pm Wednesday, experts dissect a lion and a tiger and make distinctions between the two species.

Writer Russell Banks discusses his career on Overheard With Evan Smith at 7 pm Thursday.

World-renowned classical guitarist Jorge Caballero performs the classic work Pictures At An Exhibition by Modest Mussorgsky on Arts In Context at 7:30 pm Thursday.

Chet heads to Huntsville to explore the history of Texas Founder Sam Houston, visit the Texas Prison Museum, and go SCUBA diving in the piney woods on The Daytripper at 8:30 pm

Independent Lens at 9 pm Thursday presents The Black Power Mixtape 1967-1975, a cinematic and musical journey into the black communities of America.

Michael Feinstein’s American Songbook at 9 pm Friday reveals Feinstein’s discovery of an undocumented, unknown song by one of the giants of American popular music and follows his quest to verify its authenticity.

Reggae legend Jimmy Cliff performs his greatest hits and songs from his LP Existence on Austin City Limits at 7 pm Saturday.