“Magnum P.I.”

Season one finale of private investigator drama, renewed for next season; Magnum’s ex, Hannah, who broke his heart years ago, shows up at his home with a gunshot wound, wanting his help to find her missing CIA father, whose life is in danger; Magnum asks Higgins to become his private investigations partner; 9 p.m. Monday on KIRO.

Also on Monday

“April Fools’ Day Movie Marathon,” 3 p.m. (SUNDANCE): Classic comedy movies, “Airplane!” (1980), 3 p.m.; “Airplane II” (1982), 5 p.m.; “Blazing Saddles” (1974), 7 p.m.; “Planes, Trains and Automobiles” (1987), 9 p.m.

“Hostile Planet,” 8 p.m. (NATGEO): Premiere of six-part look at the harsh life of wild animals around the world, compounded by climate change; hosted by survival expert Bear Grylls.

“The Voice,” 8 p.m. (KING): One of TV’s most-watched shows; the battles continue as the coaches enlist Charlie Puth, Kelsea Ballerini, Brooks & Dunn and Khalid to prepare their artists for dueling duets.

“DC’s Legends of Tomorrow,” 8 p.m. (KSTW): When the legends hear that Mona let a fugitive go, they head to 1961 Mexico City to resolve the situation; Nate and Zari go on a mission to find out what Hank is hiding.

“The Resident,” 8 p.m. (KCPQ): When Atlanta is struck by a severe snowstorm, Mina must perform surgery to save the life of a young father; Devon teaches an important lesson about life and death to a first-year med student.

“Penn & Teller: Fool Us,” 9 p.m. (KSTW): For April Fools’ Day, Penn and Teller prank Chris Hardwick by turning him into a world-class magician and send him to the streets of Las Vegas to entertain crowds.

“The Fix,” 10 p.m. (KOMO): Maya convinces an asset to wear a wire during a rendezvous with Sevvy; Ezra creates an alibi for Sevvy and sends his henchman, Buck, to visit to Riv at his ranch.

“Jimmy Kimmel Live! in Vegas,” 11:35 p.m. (KOMO): Kicking off a week of live shows from the Strip with scheduled guests Kim Kardashian West, Khloe and Kourtney Kardashian, music by The Killers.

Madeline McKenzie: mmckenzie@seattletimes.com. Program times may vary depending on your cable provider or service.