Having turned in a memorable episode last time he was there, Louis C.K. returns to host “Saturday Night Live” (NBC, 11:30 p.m.) on the occasion of its 40th season finale. Riahanna is musical guest. The 10 p.m. “SNL” replay, meanwhile, is a Kevin Spacey hosted show with Beck from 1997.
The documentary “Iverson” (Showtime 9 p.m.) follows the story of basketball’s Allen Iverson from troubled youth to Georgetown to the 76ers with a side trip to hip-hop culture.
A 30 year old murder gets a fresh look on “48 Hours” (CBS, 10 p.m.).
The season recap “Dancing with the Stars: Road to the Finals” (ABC, 8 p.m.) receives an unusual Saturday night slot.
It may or may not beat a straight up two hour same-week rerun of “The Voice” (NBC, 8 p.m.).
You can also file under promotion “The Billboard Music Awards: An Insider’s Guide” (ABC, 9 p.m.), looking toward Sunday’s event.
“The Universe: Ancient Mysteries Solved” (History, 9 p.m.) doesn’t solve any; instead it muses on whether the future can be predicted.
A rash of sinkholes can be defined as “Engineering Disasters” (History, 10 p.m.).
Miranda Hart, Rupert Everett and Electro Velvet are on a new “Graham Norton Show” (BBC America, 10 p.m.).
Saturday night is the place for same-week replay, so here’s the premiere of “Wayward Pines” (Fox, 9 p.m.) one more time.
Sarah is captured and tested on “Orphan Black” (BBC America, 9 p.m.).
Jamie’s execution day approaches on “Outlander” (Starz, 9 p.m.).
I don’t know about you, but I’ve been hopelessly lost in the round the clock marathon of “Mad Men” (AMC, all day) leading into Sunday’s series finale.
A new girl causes trouble at school in the made for TV movie “The Wrong Girl” (Lifetime, 8 p.m.), with Jamie Luner, Kristen Prout and Sarah Grey.
“When Calls the Heart” (Hallmark, 8 p.m.) is a series, but its episodes are as long as made for TV movies. Tonight Abigail goes to Hamilton and accepts Bill’s help.
Though local stations will often insert their own programming, especially on Saturday, the national feed has a replay of this week’s dancing programs, the history of the American Ballet Theatre, and the ballet itself, on “American Masters” (PBS, 8 p.m., check local listings) and Elizabeth Streb’s extreme action company on “Independent Lens” (PBS, 10 p.m., check local listings).
Need more proof that sweeps are over? There’s a double pack of “Shark Tank” (ABC, 9 and 10 p.m.) reruns, and reruns of “NCIS: New Orleans” (CBS, 8 p.m.), “Backstrom” (Fox, 8 p.m.) and “CSI: Cyber” (CBS, 9 p.m.).
I wonder if revenuers even bother watching “Moonshiners” (Discovery, 10 p.m.).
Singers go out of their way to stand out at talent competitions, but one who will not be forgotten is the one who gave birth during an audition, featured tonight on “Outrageous Births: Tales from the Crib” (Discovery Life, 9 p.m.)
“The Red Shoes” (TCM, 8 p.m.) gets the spotlight tonight, accompanied by another Michael Powell film, “The Tales of Hoffmann” (TCM, 10:30 p.m.) and Gene Kelly’s “Invitation to the Dance” (TCM, 12:45 a.m.).
Later comes a couple of hippie films, “An American Hippie in Israel” (TCM, 2:30 a.m.) and “I Love You, Alice B. Toklas” (TCM, 4:15 a.m.).
In an animation double bill, it’s “Ratatouille” (ABC Family, 7 p.m.) and “Finding Nemo” (TCM, 9:30 p.m.).
Stanley Cup play moves to game one of the Eastern Conference finals with Tampa Bay at Rangers (NBC, 1 p.m.).
Baseball includes Atlanta at Miami (Fox Sports 1, 1 p.m.), Pittsburgh at Cubs (Fox Sports 1, 4 p.m.) and Boston at Seattle (MLB, 9 p.m.).
And today is the second leg of the Triple Crown, the Preakness Stakes (NBC, 4:30 p.m.) at Pimlico in Baltimore.
Bon Iver plays a replay of “Austin City Limits” (PBS, 11 p.m., check local listings).