John Mulaney returns to host a new “Saturday Night Live” (NBC, 11:30 p.m.). It’s his third hosting gig in as many seasons for the comedian who was once a writer on the show. David Byrne is also returning as musical guest. His big “American Utopia” recently closed, but will be back on stage in the fall and has been filmed by Spike Lee for a movie release.
“Seven Worlds, One Planet” (BBC America, AMC, IFC, Sundance, 8 p.m.) covers its final continent – the vast worlds of Africa and its wildlife.
Another big primary today occurs with the South Carolina Democratic Primary (CNN, 4 p.m.; MSNBC, 6 p.m.). Polls close at 7 p.m. with results expected to come in a little more quickly than they did in caucuses.
The Democratic nominee’s eventual foe appears at both the ultra-right CPAC (CSPAN, 3 p.m.) and later in “Home Alone 2: Lost in New York” (AMC, 6:30 p.m.) (unless it’s the Canadian cut).
Primetime sports are a little different tonight. in addition to the NBA game of Houston at Boston (ABC, 8:30 p.m.), it’s the start of Major League Soccer with Nashville SC vs. Atlanta United (Fox, 8:30 p.m.).
The prolific producer can’t even keep his name off of kids’ shows. His new “Tyler Perry’s Young Dylan” (Nickelodeon, 8:30 p.m.) is a “Fresh Prince” type vehicle built around a young rapper Dylan Gilmer, who goes by the name Young Dylan.
Sasha Luss stars as a sultry assassin in Luc Besson’s “Anna” (HBO, 8 p.m.), making its premium cable debut. Helen Mirren and Alexander Petrov also star.
Natalie Dreyfuss and Elise Gaiten play pen pals who finally meet in the made-for-TV thriller “Dying to Be You” (Lifetime, 8 p.m.)
“John Wick” (Paramount, 7 p.m.) is followed by “John Wick: Chapter 2” (Paramount, 9:30 p.m.) and “Jack Reacher” (TBS, 5:45 p.m.) is followed by “Jack Reacher: Never Go Back” (TBS, 8:30 p.m.).
It’s only two weeks until the big mass wedding on “Say Yes to the Dress” (TLC, 8 p.m.).
William Shatner presents more of “The UnXplained” (History, 8 p.m.)..
The Leap Day listings for Turner Classic Movies’ 31 Days of Oscar has a pair of very different Dustin Hoffman movies in prime time: “The Graduate” (6 p.m.) and “Tootsie” (8 p.m.). Also on today: “Brewster’s Millions” (6:15 a.m.), “Gold Diggers of 1933” (7:45 a.m.), “The Champ” (9:30 a.m.), “The Four Musketeers” (11:45 a.m.), “The Swarm” (1:45 p.m.), “The Miracle Worker” (4 p.m.), “Oh, God!” (10:15 p.m.), “The Sunshine Boys” (12:15 a.m.), “California Suite” (2:15 a.m.) and “Hot Millions” (4:15 a.m.).
Spring baseball includes Washington vs. St. Louis (MLB, 1 p.m.).
Hockey has Boston at Islanders (NHL, 1 p.m.) and Vancouver at Toronto (NHL, 7 p.m.).
XFL action has Los Angeles at New York (ABC, 2 p.m.) and Seattle at St Louis (Fox, 5 p.m.).
Men’s college hoops includes Providence at Villanova (Fox, noon), Texas at Texas Tech (ESPN, noon), Texas A&M at LSU (ESPN2, noon), Army at Colgate (CBS Sports, noon), Kansas at Kansas State (CBS, 1:30 p.m.), Taylor at TCU (ESPN, 2 p.m.), Florida at Tennessee (ESPN2, 2 p.m.), Connecticut at East Carolina (ESPNU, 2 p.m.), Florida State at Clemson (NBC Sports, 2 p.m.), Loyola Chicago at Bradley (CBS Sports, 2 p.m.), Seton Hall at Marquette (Fox, 2:30 p.m.), Auburn at Kentucky (CBS, 3:45 p.m.), George Washington at VCU (CBS Sports, 4 p.m.), North Carolina at Syracuse (ESPN, 4 p.m.), Oklahoma at West Virginia (ESPN2, 4 p.m.), Iowa State at Oklahoma State (ESPNU, 4 p.m.), Duke at Virginia (ESPN, 6 p.m.), Northern Iowa at Drake (ESPN2, 6 p.m.), BYU at Pepperdine (CBS Sports, 6 p.m.), Central Florida at Tulsa (ESPNU, 6 p.m.), DePaul at Butler (Fox Sports 1, 6:30 p.m.), Michigan State at Maryland (ESPN, 8 p.m.), San Diego State at Nevada (ESPN2, 8 p.m.), Arizona State at Southern California (ESPNU, 8 p.m.), Memphis at Tulane (CBS Sports, 8 p.m.), Arizona at UCLA (ESPN, 10 p.m.), Saint Mary’s at Gonzaga (ESPN2, 10 p.m.) and Utah State at New Mexico (CBS Sports, 10 p.m.).
Golf has third round play in the Honda Classic (Golf, 1 p.m.; NBC, 3 p.m.).
The U.S. Olympic marathon trials (NBC, noon) are run.
Norah Jones and Angel Olsen play a 2017 “Austin City Limits” (PBS, 11 p.m., check local listings).