It's back. Shark Week 2019 on Discovery starts Sunday, July 28, and it's sure to be, well, shark-filled. Discovery is planning more than 20 hours of new Shark Week programming, hosted by comedian Rob Riggle.

Here are the best shows, specials and more you should watch every night of Shark Week 2019, which runs through Aug. 4.

"Expedition Unknown: Megalodon." Sunday, July 28, 8 p.m. EST. Everyone's heard of the megalodon — a massive shark, now extinct — that lived as much as 3.6 million years ago. TV host Josh Gates heads to Mexico and South Africa to search for fossilized teeth of the massive predator.

"Shark Trip: Eat Prey Chum." Sunday, July 28, 9 p.m. EST. The 121-minute special features comedian Rob Riggle, who is planning a "guys trip" for his friends and fellow comedians. Adam DeVine, Anthony Anderson, Joel McHale and Damon Wayans Jr. But there's a catch — according to Discovery, the "guys trip" is actually a mission to locate the largest tiger shark in the Caribbean. Who knew Shark Week could be so funny?

"Legend of Deep Blue." Monday, July 29, 9 p.m. EST. Divers are headed for Guadalupe Island, a volcanic island off the coast of Mexico's Baja California Peninsula, in search of "Deep Blue," believed to be the largest great white shark ever spotted. "Deep Blue" is rumored to measure nearly 22 feet long and weigh over 2 tons. 

"The Sharks of Headstone Hell." Monday, July 29, 10:01 p.m. EST. Scientists say Norfolk Island, a tiny Australian island in the Pacific Ocean, has some of the largest tiger sharks on earth, who are attracted to the area by full-sized animal carcasses locals toss into the sea. Scientists will travel to the area to see if the humans' new habit has altered the sharks' behavior.

"Laws of Jaws: Dangerous Waters." Tuesday, July 30, 9 p.m. EST. It's a myth-busting shark week as five experiments are put to the test, including "electronics to trigger a shark encounter and sharks investigating paddleboards that may cause you to fall off."

Map: Where great white sharks roam off Cape Cod

"Extinct or Alive: The Lost Shark." Wednesday, July 31, 8 p.m. EST. Outdoorsman and biologist Forrest Galante is on the search for a supposedly extinct shark rumored to actually be alive in the Maldives.

"Capsized: Blood in the Water." Wednesday, July 31, 9 p.m. EST. It's Discovery's first-ever Shark Week movie, based on the true story of the crew of a capsized yacht drifting for days in shark-infested waters in October 1982.

"Return to Shark Island." Thursday, Aug. 1, 8 p.m. EST. According to Discovery, locals living in Reunion Island, a French volcanic island in the Indian Ocean, are afraid to swim due to shark encounters on the rise. Naturally, shark scientists are headed there to investigate.

"Isle of Jaws: Blood Brothers." Friday, Aug. 2, 8 p.m. EST. Do sharks hang out with their families. Two male great white sharks are believed to be brothers, and scientists are headed to investigate along the Isle of Jaws in Australia to find out whether sharks recognize and spend time with blood relatives.

Drone video captures great white shark interaction off Cape Cod

"Andrew Mayne: Ghost Diver." Friday, Aug. 2, 9 p.m. EST. Illusionist Andrew Mayne will attempt to create a suit to make himself appear invisible to a great white shark.

"Sharks Gone Wild 2." Saturday, Aug. 3, 8 p.m. EST. Want a whole bunch of sharks crammed into an hour? Check out the past year's best — and scariest — shark videos.