“Xtreme Waterparks: Building the World’s Longest” airs on Travel Channel 8 p.m., Sunday, June 21.

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‘True Detective’

Take a deep breath. All the elements that made the premiere season of writer/creator Nic Pizzolatto’s crime drama such a buzzed-about hit are back for season two. The new setting is a gritty, film-noir version of present-day Los Angeles. There are three tortured law-enforcement officers this time out (Colin Farrell, Rachel McAdams and Taylor Kitsch), plus Vince Vaughn as a slimy criminal. And there’s a twisted murder to bring all the elements together. I said it last year when the show premiered, but it bears repeating: This is some deep, layered, “must-see” television. Season premiere, 9 p.m. Sunday, June 21, on HBO.

Doug Knoop: dknoop@seattletimes.com or on Twitter @dougknoop

Also on Sunday

“MLB Baseball,” 1 p.m. (ROOT): Houston Astros at Seattle Mariners (Live).

“Show Boat” (1936), 7 p.m. (TCM): A Mississippi riverboat captain’s daughter marries a roving gambler.

“Xtreme Waterparks: Building the World’s Longest,” 8 p.m. (Travel): The world’s longest water slide at 2,000 feet created by Jimi Hunt in New Zealand.

“A.D. The Bible Continues,” 9 p.m. (NBC): The arrival of Emperor Caligula’s statue draws everyone to the battleground of the temple; Cornelius becomes the first Roman convert.

“Poldark on Masterpiece,” 9 p.m. (KCTS): After fighting for England during the American Revolution, Capt. Ross Poldark returns home to Cornwall.

“Halt and Catch Fire,” 10 p.m. (AMC): Joe and Gordon reunite to turn Joe’s vision into a reality; tensions run high between Cameron and Donna in the aftermath of Sonaris.