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Well, it's another "live" episode of a sitcom — which generally turns out to be more of a gimmick than anything else.

This time, it's "Undateable" (8 p.m., NBC/Ch. 5). In this hourlong live episode, Danny and Justin woo a sightly backup singer (Victoria Justice) they met in a bar.

As is generally the case, the "live" episode isn't live here. It's tape-delayed in the Mountain Time Zone.

Elsewhere on TV ...

"NCIS" (7 p.m., CBS/Ch. 2): Evidence confirms that an international terrorist group has been purchasing S-bombs off the black market.

"Dancing with the Stars" (7 p.m., ABC/Ch. 4): Another pair is eliminated.

"The Voice" (7 p.m., NBC/Ch. 5): Another contestants is eliminated.

"Hell's Kitchen" (7 p.m., Fox/Ch. 13): The contestants must present three courses to the discerning palates of the Calabasas High School homecoming committee, who have requested Mardi Gras-inspired cuisine.

"The Flash" (7 p.m., CW/Ch. 30): Dr. Wells unleashes Grodd on the city in order to distract Barry and the team.

"NCIS: New Orleans" (8 p.m., CBS/Ch. 2): To send a message to Pride, Baitfish murders someone close to the NCIS team.

"Marvel's Agents of S.H.I.E.L.D." (8 p.m., ABC/Ch.4): Skye has conflicted feelings about whether to side with S.H.I.E.L.D. or the Inhumans; Agent Coulson shares a secret he's kept from everyone.

"Undateable" (8 and 8:30 p.m., NBC/Ch. 5): Danny and Justin woo a sightly backup singer (Victoria Justice) they met in a bar in this "live" episode — which is, of course, tape-delayed in the Mountain Time Zone.

"New Girl" (8 p.m., Fox/Ch. 13): Coach prepares to move out of the loft; Jess and Nick wonder if they still have feelings for each other. (Season finale. The show has been renewed for another season.)

"iZombie" (8 p.m., CW/Ch. 30): Liv and Clive work together to solve the murder of a morning radio talk show host who specialized in relationship straight talk.

"Your Family Or Mine" (8 p.m., TBS): Louis's urine sample may be a problem because he smoked pot just a week earlier.

"Younger" (8 and 11 p.m., TV Land): Liza needs to earn some quick cash when her ex comes up short on a tuition payment.

"Weird Loners" (8:30 p.m., Fox/Ch. 13): The gang hangs out at a lesbian bar. (Season finale. And, given the ratings, it's probably the series finale, too.)

"Person of Interest" (9 p.m., CBS/Ch. 2): Finch and Root race to save The Machine, which has been located by the rival AI.

"Forever" (9 p.m., ABC/Ch. 4): Amuseum worker's death triggers an investigation that hinges on a missing dagger that was used to kill Julius Caesar. (Season finale. The show has not been renewed, and it's not looking good for a second season.)

"Chicago Fire" (9 p.m., NBC/Ch.5): Casey goes undercover to get proof of Nesbitt's shady dealings.

"Frontline" (9 p.m., PBS/Ch. 7): A report on the Ebola epidemic and the missteps in attempting to contain it.

"Independent Lens" (11 p.m., PBS/Ch. 7): A native Hawaiian mahu (transgender) teacher inspires a tomboyish girl to become the leader of an all-male hula troupe.

"Finding Carter" (11 p.m., MTV): Carter tries to extricate Crash from a bad situation.