TV Best Bets

World’s Biggest Bull Shark?

This one-hour special revisits a 2012 human and shark encounter that shattered most records. Off the coast of Florida, Dr. Neil Hammerschlag, a shark scientist, caught a bull shark that stretched more than 10 feet in length and weighed more than half a ton. After tagging the creature they dubbed Big Bull, they set her free. Since then, scientists who are watching large bull sharks that regularly scare beach visitors in Florida have started to wonder whether Big Bull is actually the matriarch of a unique population of finny giants. (TVPG) 7 p.m. on NGEO.

Mothersharker

Sharks are among the most studied of all marine creatures, but the question of where pregnant tiger sharks go to give birth remains shrouded in mystery. In this new one-hour special, a team of scientists and shark experts that includes Dr. James Sulikowski, Dr. Toby Daly-Engle, Dr. Neal hammerschlag and Jamin Martinelli deploys a veritable arsenal of new technology to get some answers Ñ that is, as long as they can find some of the biggest shark mothers in the Bahamas. (TV14) 8 p.m. on DSC.

7 Little Johnstons

Season 9 calls it a wrap with the finale “Liz Leaves the Nest,” as Elizabeth becomes the first child among the very large brood to move out into her own house. Meanwhile, her sister Anna hopes she’ll be following Elizabeth out the door in the very near future, but she may not have convinced her parents that she’s responsible enough. (TVPG) 8 p.m. on TLC.

The Secret of Skinwalker Ranch

If this eerie sci-fi paranormal docuseries gave viewers the willies before now, the producers saved some of the biggest goosebumps for tonight’s Season 2 finale, “It Follows,” which finds members of Travis Taylor’s team investigating what they have termed the Triangle Area, nearly a mile above the ranch in Brandon’s helicopter. Their focus is divided, however, once more than one team member gets the uneasy but distinct feeling that their group is being shadowed by some kind of invisible entity. (TVPG) 9 p.m. on HIST.

Little People, Big World

In the new episode “What’s Your Surprise?,” it’s Valentine’s Day, and the holiday prompts Chris and Amy to take a stroll together down memory lane about their relationship, especially as they get closer to their wedding date. Meanwhile, Matt unfortunately makes a big mistake as he tries his best to prepare the farm for Amy’s summer wedding. Elsewhere, Zach and Tori have a huge secret. (TVPG) 9 p.m. on TLC.

Brad Paisley’s Shark Country

The phrase “rough crowd” takes on a whole new meaning for country superstar Brad Paisley in this new house, as he and comic JB Smoove (“Curb Your Enthusiasm”) meet in the Bahamas hoping to draw new fans. Dr. Austin Gallagher uses Paisley’s proven musical gifts as a tool in a study of shark-infested waters, to see how sounds can either attract or repel sharks in the vicinity. (TVPG) 9:01 p.m. on DSC.

Mr. Inbetween

Scott Ryan bids farewell to the role of multi-faceted hitman Ray Shoesmith as this dark half-hour comedy-drama ends its run after three seasons. Ryan first created the character for the 2008 mockumentary “The Magician,” but Ray’s mind-boggling self-contradictions – he was a devoted son, father and friend, in stark contrast to his violent career – provided ample fodder for a weekly TV series. After this past season, Ray is due for some time off, having dealt with the death of his special-needs brother, Bruce, as well as other personal blows. (TVMA) 10 p.m. on FX.

Motherland: Fort Salem

Intense anti-witch sentiment reaches the boiling point as the Unit tries to defend its first witch testing center at the facility’s grand opening in the new episode “Not Our Daughters.” Meanwhile, Anacostia and Scylla (Demetria McKinney, Amalia Holm) put their lives at risk to go undercover and follow the Camarilla. Taylor Hickson, Jessica Sutton and Ashley Nicole Williams also star. (TV14) 10 p.m. on FREE.

The Spawn of El Diablo

Back in 2012, zoologist Michelle Jewell documented one of the largest great white mating scars on the body of a female shark ever recorded. More recently, she has begun to notice similar scars on females, leading her to suspect she has found a possible mating ground near South Africa that is favored by a mega-shark known as El Diablo, who was thought to have left this region. (TVPG) 10:02 p.m. on DSC.

Miracle Workers

This comedy anthology series returns for Season 3, which means a change in setting and story. The season premiere, “Oregon Trail: Hittin’ the Trail,” follows an idealistic, somewhat naive small-town preacher (Daniel Radcliffe) who joins an outlaw fugitive (Steve Buscemi) and a fearless prairie wife (Geraldine Viswanathan) to lead a wagon train west on the Oregon Trail, circa 1844. Their journey takes them across an American landscape that, much like today’s, is filled with both promise and peril. Karan Soni and Jon Bass co-star. (TVMA) 10:30 p.m. on TBS.