1) “Sharks Up Close,” 8 p.m., National Geographic. On Earth Day, we saw Bertie Gregory (shown here) communing with cute penguins. Now he goes the other way — hoping to swim with great white sharks off South Africa. There’s a lot of frustration here, but there are some good moments with gorgeous filming.
2) More sharks. It’s opening day of National Geographic’s “SharkFest,” two weeks ahead of Discovery’s “Shark Week.” Each day starts reruns at 9 a.m.; most have two fairly interesting series at night: At 9 is “Investigation Shark Attack”; tonight, it probes great-whites in California. At 10, “Super Shark Highway” has two teams tagging and filming in Australia.
3) Movies. With summer action films now in theaters, cable gives us the previous ones: A new “Jurassic” film arrived Friday; FX reruns the others, in order, at 10:30 a.m. and 1:30, 4:30, 6:30 and 9 p.m. And “Superman” arrives next Friday; TBS has the original (1978) at 8 p.m., preceded by “Man of Steel”(2013) at 5.
4) “Saturday Night Live,” 11:29 p.m., NBC. This reruns the season’s second-to-last episode. Walton Goggins — big on HBO lately, with “White Lotus” and “Righteous Gemstones” — had his first turn as host. Arcade Fire had its seventh (spanning 18 years) as the music guest.
5) MORE, all at 8 p.m.: ABC has three episodes of “What Would You Do?” CBS reruns an “FBI: Most Wanted” episode, with a hostage crisis at a Veterans Administration hospital. And HBO has “Sinners,” an action/horror film that was a big success with critics and at the box office.