What to Watch This Weekend: The Start of Merlin's Last Spell, Zach Galifianakis on SNL, and the Season Finales of Happy Endings, The Mentalist, and The Amazing Race

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What to watch on Friday, May 3...


8pm, The CW
Nikita
A turncoat agent under Amanda’s control gets a hold of the black box, and it’ll take a risky operation to recover that “High-Value Target.” Nikita, Michael, and Alex must join forces with arms dealer Cyrus (Isaiah Mustafa) to storm the heavily guarded G-20 summit, retrieve the box, and, as long as they’re there, pass out some copies of Nikita’s meticulously researched white paper on renewable energy subsidies.


SEASON 3 FINALE, 8pm & 8:30pm, ABC
Happy Endings
Megan Mullally and Michael McKean return to add some alliterative appeal to “Deuce Babylove 2: Electric Babydeuce,” as Penny’s mom and Dave’s dad visit to announce their plan to adopt a baby together. Then, “Brothas and Sisters” hopes it isn’t the last new episode of Happy Endings ever, and it trots out Jane and Alex’s elder sister Brooke to make the case for renewal.


9pm, CBS
Vegas
Sheriff Lamb deals with “Unfinished Business” as new details regarding his wife’s death emerge, and as he investigates the demise of Porter Gainsely’s lawyer. The probe prompts a retaliatory assault that sends Katherine to the hospital and costs the sheriff his badge.


9pm, Starz
Da Vinci’s Demons
When the Roman and Florentine armies butt heads, Leonardo puts his newest weapon into action. But it’s a different sort of action that concerns the authorities, who later arrest the inventor for sodomy in “The Magician.” Elsewhere, Bechhi is hauled in on charges of spying for Rome.


SEASON 5.5 PREMIERE, 10pm, Syfy
Merlin
The final five episodes kick off with Merlin informing Arthur of Guinevere’s whole treachery-inspired-by-dark-magic meshugas, and vowing to nip all that in the bud. It’ll require a trip to see the Dochraid in “With All My Heart,” but that’s only the beginning of the perilous ordeal.


SERIES PREMIERE, 10pm, IFC
Maron
Marc Maron , host of the comical/confessional podcast WTF, brings his professional oversharing to the small screen in this quasi-autobiographical series. The premiere finds the comedian battling a pesky internet troll alongside podcast guest Dave Foley.


LATE-NITE:
– Chris Evans and Kevin Smith on The Tonight Show with Jay Leno, 11:35pm, NBC
– Nathan Lane, Joe Matarese, and Kacey Musgraves on Late Show with David Letterman, 11:35pm, CBS
– Carey Mulligan, Alexander Skarsgård, John Densmore, and Eve on Late Night with Jimmy Fallon, 12:37am, NBC
– Angela Kinsey and Simon Amstell on The Late Late Show with Craig Ferguson, 12:37am, CBS



WHAT ARE YOU WATCHING TONIGHT?


What to watch on Saturday, May 4...


8pm, NBC
Smash
“An unexpected event bonds both Bombshell and Hit List,” says a logline for “The Phenomenon” that’s evidently succumbed to full-blown senioritis. Shall we all speculate on what that event might be? Ellis returning to command an army of mole people on a rampage through Manhattan, for instance? Or shall we just mail this one in like seemingly everyone else affiliated with Smash is doing at this point?


8pm, BBC America
Doctor Who
A picturesque Victorian mill may be harboring a sinister secret in “The Crimson Horror,” what with all the red, waxy corpses plopping ashore from the nearby river. Vastra, Jenny, and Strax must get to the bottom of the mystery before it claims the missing Doctor and Clara next.


9pm, BBC America
Orphan Black
“Variations Under Domestication" sends Alison’s paranoia past the tipping point, jeopardizing all the Orphans and seriously crimping the supply of orange slices at the local youth soccer matches. As the lines blur among Sarah, Alison, and Beth’s worlds, Sarah must determine who can be trusted with her secret.


11:30pm, NBC
Saturday Night Live
Zach Galifianakis hosts to promote whichever number of Hangover movie we’re up to, and Icelandic sextet Of Monsters and Men is the musical guest.



WHAT ARE YOU WATCHING TONIGHT?


What to watch on Sunday, May 5...


SEASON 21 FINALE, 8pm, CBS
The Amazing Race
Four teams remain when the two-hour “Beacon of Hope” kicks off in Belfast, where a bog-snorkeling competition will determine the final three. And speaking of wading through a morass of noxious, excrescent glop, the finish line and the $1 million prize are waiting in Washington, D.C. Hey-o!


8pm, ABC
Once Upon a Time
Regina’s vanished, and so have some magic beans, prompting Emma, Mary Margaret, and David to form a search party. I’d suggest they keep their eyes peeled for a big honkin’ vegetable monolith, but I am not a professional fairy-tale citizen, so take my advice with a grain of salt. Meanwhile in “Second Star to the Right,” Rumplestiltskin lets his son go sauntering off through the nearest magic portal, and Bae winds up in the 19th century London abode of Wendy Darling.


9pm, HBO
Game of Thrones
Having proven his mounting abilities, Jon joins Ygritte and the other wildlings for a treacherous trek up the Wall in “The Climb.” Meanwhile, Robb attempts to mend fences with the Freys, Melisandre drops in on the Riverlands, Roose Bolton mulls Jaime’s fate, and Tywin plays matchmaker for his children.


9pm, Lifetime
Army Wives
Claudia Joy’s dedication ceremony brings the tribe together in “Blood and Treasure.” Elsewhere, an emergency at the hospital ties up Denise, Michael and Kat grow closer outside of work, Patrick ends things with Gloria for the greater good of his unit, Roland drops an ultimatum on Joan, Maggie realizes Caroline has been dishonest about her after-school activities, and even Game of Thrones tips its bloody cap to how many storylines this episode is cramming into 44 minutes.


150TH EPISODE, 9:30pm, Fox
American Dad
“Lost in Space,” the series’ 150th episode, turns the spotlight on everyone’s favorite boyfriend of Hayley’s who got abducted by an alien spaceship after discovering Roger is not of this world: Jeff. To elude the clutches of the terrifying Emperor Zing (Michael McKean), the lovestruck lad must prove that his feelings for Hayley have been pure and eternal.


10pm, Food Network
Iron Chef America: Tournament of Champions
Culinary luminaries from Kitchen Stadiums past vie for scullery supremacy in the five-part Tournament of Champions. The series kicks off with Season 10 champ Geoffrey Zakarian matching saucepans with Season 11 victor Alex Guarnaschelli.


SEASON 1 FINALE, 10 pm, PBS
The Bletchley Circle
Obsessed with Susan, the killer leaves a string of false clues to lure her into a trap in the first season finale. Will the amateur detective take the bait and meet her doom, thus reducing the circle to a... well, okay, I guess three can form a circle as well as four. Circles are flexible that way, geometrically speaking. What was I talking about again?


SEASON 1 FINALE, 10 pm, ABC
Red Widow
Convinced Schiller is behind her husband’s murder, Marta seeks Andrei and Luther’s help to bring him down in “The Hit.” She’s also fixin’ to set up Alexandra as Schiller’s replacement in the drug trade, because vengeance doesn’t obviate the need for sound succession planning.


SEASON 5 FINALE, 10pm, CBS
The Mentalist
Jane whittles down his Red John suspect list to seven possibilities, while Red John narrows his “people from Jane’s past I’m gonna attack this week” list to one. But whom?! “Red John’s Rules” will reveal all, or more likely some, since the press release specifically calls it a cliffhanger, and who am I to doubt the word of a network television press release?


10pm, AMC
Mad Men
Roger shifts gears in pursuit of new business and Pete faces an awkward encounter with a client in “For Immediate Release.” On the fake storyline front, Ken picks up Simon & Garfunkel’s Bookends LP and spends a pleasant evening enjoying it with his wife, because life is pretty chill for ol’ Ken Cosgrove.



WHAT ARE YOU WATCHING TONIGHT?


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