SHARK TRIP: EAT PREY CHUM 9 p.m. on Discovery. This two-hour episode from Will Packer, the producer of “Girls Trip,” is part educational shark program, part buddy comedy. The comedian and retired Marine Corps Reserve officer Rob Riggle takes Anthony Anderson, Adam DeVine, Joel McHale and Damon Wayans Jr. on a guys’ trip that includes some close encounters with sharks. At one point, Riggle persuades Anderson and Wayans to hop into “the human aquarium,” a transparent box that bobbles in shark-infested seas, while McHale and DeVine throw chum into the water around the cage.

NOS4A2 9 p.m. on AMC. The first season of this horror series starring Zachary Quinto has its two-part finale. Based on a novel by Joe Hill, Stephen King’s son, the show is a creative take on the vampire genre. Quinto plays Charlie Manx, a demon with an appetite for children’s souls, and Ashleigh Cummings portrays Vic McQueen, a young woman with superhuman powers who tries to rescue Manx’s victims. Like much of Hill’s horror, “NOS4A2” focuses more on the development of complex characters than on delivering shock. “I think some people think horror is about sadism; it’s about flinging intestines at the camera,” the author told The New York Times. “And some is. And I like some of that stuff. But I do think the really effective horror is about empathy.”