Speaking of disaster, the 1986 explosion at the Chernobyl nuclear plant in Ukraine is still considered one of the “Mysteries of the Abandoned” (Science, 9 p.m.), as engineer Philip Grossman looks into what might have caused it.
On the two hour documentary “Rancher, Farmer, Fisherman” (Discovery, 9 p.m.) follows conservationists in each of those fields. It’s narrated by Tom Brokaw.
The second season “Queen of the South” (USA, 10 p.m.) comes to an end with a battle between Teresa and Camila on who will become the real queen.
It’s also the fourth season finale at “The Late Shift” (NBC, 10 p.m.), marked by a shooting at a college.
Today is the actual 20th anniversary of her death so every recent Diana special seems to be rerunning, including “Princess Diana: Behind Closed Doors” (Reelz, 8 p.m.), “Diana and the Paparazzi” (Smithsonian, 8 p.m.), “Diana – Her Story” (PBS, 9 p.m., check local listings), “Princess Diana’s Death: Mystery Solved” (Reelz, 9 p.m.), “Diana: The Day We Said Goodbye” (Smithsonian, 9 p.m.),
Michael Rapaport checks in on “The Guest Book” (TBS, 10:30 p.m.).
Jackson attacks Abigail on “Zoo” (CBS, 10 p.m.).
Matt or Raven will be evicted on “Big Brother” (CBS, 9 p.m.) after Jason changed his plans.
Maddie Ziegler is guest judge on “Project Runway” (Lifetime, 9 p.m.) as designers have to make something inspired by the movie “Leap!”
No one has done a study on how climate change has affected “Ice Road Truckers” (History, 10 p.m.), whose season has started badly.
Thin ice plays a role too on “Mountain Men” (History, 9 p.m.) and “Life Below Zero: Ice Breakers” (National Geographic, 9 p.m.).
The baby arrives on “Flipping Out” (Bravo, 9 p.m.).
A couple who met in the ER get the “Kiss of Death” (Investigation Discovery, 9 p.m.).
A printing press is connected to a founding father’s secret identity on “Mysteries at the Museum” (Travel, 9 p.m.).
A family emergency forces Abby out of town on “Girlfriends’ Guide to Divorce” (Bravo, 10 p.m.), leaving Barbara to make tough decisions alone.
There’s a fitness test on “Dallas Cowboys Cheerleaders: Making the Team” (CMT, 10 p.m.).
Nina Turner is guest on “The President Show” (Comedy Central, 11 p.m.).
“What Would Diplo Do?” (Viceland, 10 p.m.) gets all emotional.
The final star in Turner Classic Movies’ month-long Summer Under the Stars is a fitting queen: Elizabeth Taylor. Her day of movies has “National Velvet” (6 a.m.), “Father of the Bride” (8:15 a.m.), “Rhapsody” (10 a.m.), “Ivanhoe” (noon), “The Last Time I Saw Paris” (2 p.m.), “The Sandpiper” (4 p.m.), “The V.I.P.S.” (6 p.m.), “Butterfield 8” (8 p.m.), “Cat on a Hot Tin Roof” (10 p.m.), “Daintree County” (midnight) and “Night Watch” (3 a.m.) and the 1975 documentary “Elizabeth Taylor: An Intimate Portrait” (4:45 a.m.).
Preseason football includes Philadelphia at Jets (NFL, 7 p.m.) and Seattle at Oakland (NFL, 10 p.m.).
And college football begins with Florida International at UCF (CBS Sports, 6 p.m.), Tulsa at Oklahoma State (Fox Sports 1, 7:30 p.m.), Ohio State at Indiana (ESPN, 8 p.m.) and Louisiana Monroe at Memphis (CBS Sports, 9:15 p.m.).
Baseball includes White Sox at Minnesota (MLB, 1 p.m.) and Boston at Yankees (MLB, 7 p.m.).
And second round play begins in the U.S. Open (ESPN2, 1 p.m.).
Daytime Talk
Kelly Ripa and Ryan Seacrest: Matt Bomer, Debi Mazar, Matt Iseman, Anderson Cooper. The View: Laverne Cox (rerun). The Talk: Michael Vartan, Kit Hoover (rerun). Harry Connick: Scotty McCreery, Jeff Watson (rerun). Ellen DeGeneres: Kim Kardashian (rerun). Wendy Williams: Mario Batali, Carla Hall, Clinton Kelly (rerun). The Real: Lorenz Tate, Kandi Burruss (rerun).
Late Talk
Stephen Colbert: Jason Bateman, Muse (rerun). Jimmy Kimmel: Ray Romano, Paula Patton, Bryson Tiller (rerun). Jimmy Fallon: Billy Crystal, Derek Hough, Les Twins, Jessie Reyez (rerun). Seth Meyers: Tracy Morgan, Michael McKean, Sen. Ben Sasse, Mark Giuliana (rerun). James Corden: John Bodega, Jeffrey Tambor, Rag N’Bone Man (rerun). Carson Daly: Jeff Garlin, Gallants, Mary Mack (rerun). Trevor Noah: Reid Hoffman. Conan O’Brien: Marisa Tomei, Gabrielle Union, Jackie Kashian (rerun).