The Week’s guide to what’s worth watching

Stargate Universe

Now that this well-produced series has entered the second half of its final season, the sci-fi saga that began with the 1994 film Stargate may finally be nearing its close. In “Twin Destinies,” human refugees aboard the badly damaged alien spaceship Destiny ponder evacuating via Stargate—­but then an unexpected visitor arrives from the future with a warning. Robert Carlyle stars. Monday, March 14, at 10 p.m., Syfy

Nazi Hunters: Assassin of Rome

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In 1944, Nazi SS officer Erich Priebke orchestrated the massacre of hundreds of Italian civilians in Rome. After the war he fled to Argentina, where he lived free for 50 years. This documentary tells the surprising story of how Sam Donaldson and an ABC News crew found him, leading to Priebke’s long-delayed trial for war crimes. Wednesday, March 16, at 9 p.m., National Geographic Channel

Flying Wild Alaska

This colorful docuseries spotlights the Twetos, a hardy family who run their own airline in remote Unalakleet, Alaska. In the season finale, as winter looms, the staff of Era Alaska contend with a bootlegger trying to smuggle illegal liquor, and a pilot races to rescue a missing snow-machiner before two months of darkness close in. Friday, March 18, at 9 p.m., Discovery

Beast Hunter: Serpent of the North

In this new series, National Geographic follows young wildlife researcher Pat Spain as he emulates his famous uncle, Charles Fort, who investigated strange phenomena. This week takes Spain to British Columbia in search of North America’s answer to the Loch Ness monster: Cadborosaurus, a supposed sea serpent that hundreds have claimed to have seen. Friday, March 18, at 9 p.m., National Geographic Channel

Ahead of Time

In 1931, 20-year-old Ruth Gruber became the world’s youngest Ph.D. She went on to become the first foreign correspondent to enter the Soviet Arctic. She also led a secret mission to bring Holocaust refugees to America, covered the Nuremberg trials, and took historic photos aboard the ship Exodus. In this documentary, the award-winning journalist, now 99, looks back at her adventurous life. Saturday, March 19, at 9:30 a.m., Showtime

Other highlights

The Nate Berkus Show

The designer reveals techniques for quickly upgrading homes. Also: A New Orleans couple show how they rebuilt a Creole cottage destroyed by fire. Wednesday, March 16; check local listings for time and channel

Manhunters: Fugitive Task Force

In the Season 3 premiere, cameras follow U.S. marshals tracking both an accused rapist and a convicted felon involved in drug trafficking. Thursday, March 17, at 10 p.m., A&E

BBC Earth Sunday

Five nature documentaries air back to back: All About Apes, Rhinos: Built to Last, Wolf Battlefield, Cheetahs: Fast Track to Freedom, and Amazon: Super River. Sunday, March 20, at 2 p.m., BBC America