WATCH THIS: SUNDAY
“Expedition Unknown: Megalodon” (7 p.m., 2 a.m., Discovery): Shark Week 2019 officially gets under way with this new documentary that looks way, way back to the 60-ton shark-like creature that was five times as large as a Tyrannosaurus rex and ruled the world’s oceans as apex predator for nearly 20 million years before inexplicably disappearing. Where did this behemoth go? Paleontologists use fossilized teeth from one of these creatures to take a bite out of this baffling mystery, and also search for clues among its contemporary descendants. Josh Gates and Alison Towner dive into shark infested waters to further investigate. “Celebrity Family Feud” (7 p.m., ABC): Two teams of professional boxers vie to raise money for their favorite charities in a “Maulers vs. Brawlers” opening round of this new episode. Among the featured fighters are Andre Ward, Danny García, Amir Khan, Antonio Tarver, Claressa Shields and Andre Berto. Round 2 pits Dove Cameron, Sofia Carson and other cast members from Disney Channel’s upcoming TV movie “Descendants 3” against “American Housewife” stars Katy Mixon, Diedrich Bader, Meg Donnelly, Daniel DiMaggio and Peyton Meyer.
“NOS4A2” (8 p.m., 10 p.m., 2:05 a.m., AMC): This effective series adaptation of Joe Hill’s literary chiller wraps up Season 1 with a double-barreled episode. Vic (Ashleigh Cummings) shrugs off Maggie’s (Jahkara Smith) warning, determined to attempt the rescue of a loved one in danger. Elsewhere, Manx (Zachary Quinto) becomes privy to a disappointing detail about Vic, who recruits a local biker to help her try to stop the villain. On his way to Christmasland, Manx makes a pit stop.
“Shark Trip: Eat Prey Chum” (8 p.m., 11 p.m., Discovery): Actor and comic Rob Riggle (“Holey Moley”) campaigns to get his very own Shark Week special, but his only likely route to that goal is to persuade some of his celebrity friends to join him in swimming with sharks. In short order, though, the trip is booked, bags are packed and Rob and his buddies embark on their adventure. There’s a better chance, however, that Rob’s friends have no idea what they’ve signed up for.
“Ripley’s Believe It or Not!” (8 p.m., 11 p.m., TRAVEL): Among stories in the new episode “Great Obsessions” is the tale of how Michael Uy took his rescue dog, Abbie, with him on so many surfing adventures that she eventually entered the record books for “longest wave surfed by a dog.” Police officer Jeff Bloch is obsessed with building unconventional cars — including one made from helicopter parts — and then racing them. Brazilian siblings Tony and Alvaro worked out obsessively until they transformed themselves into lookalikes for the Hulk and Conan the Barbarian.
“To Tell the Truth” (10 p.m., ABC): Who is the reigning air guitar champion? If you’re like most everyday folk, you probably have no idea, which means you couldn’t pick that person out of a small group of three candidates. That’s one of the challenges facing celebrity panelists Norman Lear, Bob Saget, Joel McHale and Rita Moreno, however, in tonight’s new episode of the classic game show reboot. Other rounds find the quartet similarly trying to identify a celebrated photographer and a prize-winning burlesque dancer. Anthony Anderson is the host.
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Alison Towner and Josh Gates