Masterpiece_PoirotS12_lead2_t614Say farewell to David Suchet, doing his final five episodes as Agatha Christie’s great detective Hercule Poirot on “Masterpiece Mystery!” (PBS, 9 p.m., check local listings. In the first he investigates the murder of a Russian chess master.

Alaska continues to fascinate reality show producers, if not watchers. There is a good reason to watch frigid-weather shows, though, in the stifling heat of summer. One new one tonight is about the people of Great Slave Lake in Canada’s Northweat Territories. The people there call themselves “Ice Lake Rebels” (Animal Planet, 10 p.m.). (I’m guessing there’s not an overload of animals in the series, though).

On the other hand, on the six part “Escaping Alaska” (TLC, 10 p.m.) follows some native Inuit, Yupik and Inupiaq who have had enough of the cold and are moving to San Diego.

The disease is spreading fast on “The Strain” (FX, 10 p.m.), as is word about this entertaining, frightful series.

There are health problems, too, on “Falling Skies” (TNT, 10 p.m.).

“The Hunt with John Walsh” (CNN, 9 p.m.) goes after the alleged sledgehammer killer from Bethesda of 1976, possibly living in Europe. Not to be confused with “Beachfront Hunt” (HGTV, 8 p.m.).

Gotta love a network that runs four episodes of “Parks and Recreation” (Esquire, 8 p.m.) followed by reruns of “Party Down” (Esquire, 10 p.m.) that happens to run opposite Lizzy Caplan’s more serious work in “Masters of Sex” (Showtime, 10 p.m.).

Celia introduces Alan to his her sister on a new “Last Tango in Halifax” (PBS, 8 p.m.).

On a new “Vicious” (PBS, 10:30 p.m., check local istings), Freddie and Stuart invite Ash and his new girlfriend to dinner.

They travel to Nepal in one episode of “Finding Bigfoot” (Animal Planet, 8 p.m.) and don’t. And then they spend two hours at the Four Corners in Southwestern U.S. at 9 p.m. and still don’t.

Here’s a network who gives up the evening to mammals of different sorts: “Queen of the Warthogs” (Nat Geo Wild, 8 p.m.), “Honey Badgers” (Nat Geo Wild, 9 p.m.), and “American Beaver” (Nat Geo Wild, 10 p.m.).

Hey, it’s ending! The 21st and final stage of the 2014 Tour de France (NBC Sports Network, 9 a.m.) runs from Evry to the finish line at the Champs-Elysees in Paris.

Unforeseen opponents bedevil the computer creators on “Halt and Catch Fire” (AMC, 10 p.m.).

I’m so far behind on “Big Brother” (CBS, 8 p.m.), I’m not sure who will be nominated for evictions, let alone who is head of household.

The eerie 1942 “Cat People” (TCM, 8 p.m.) is followed by the 1944 sequel “The Curse of the Cat People” (TCM, 9:30 p.m.), followed by a documentary on the producer, “Martin Scorsese Presents Val Lewton: the Man in the Shadows” (TCM, 10:45 p.m.).

Sunday Talk

ABC: Sen. John Cornyn, Reps. Harry Cuellar and Tom Cole, former Labor Secretary Robert Reich. CBS: Israeli Prime Minister Benjamin Netanyahu, Rep. Mike Rogers, Ukrainian Foreign Minister Pavlo Klimkin, former Secretary of State Madeleine Albright. NBC: Netanyahu, Rep. Paul Ryan. CNN: Netanyahu, Klimkin, Palestinian Economic Council for Research and Development Minister Mohammad Shtayyeh, Deputy National Security Adviser Ben Rhodes, House Minority Leader Nancy Pelosi, Sens. Lindsey Graham, Chris Murphy, Former National Security Adviser Stephen Hadley. Fox News: Netanyahu, Rep. Steve Scalise, Israeli Ambassador to the U.N. Ron Prosor, Palestinian leader Hanan Ashrawl.