Mark Cuban, Daymond John, Barbara Corcoran, Kevin O’Leary, Robert Herjavec and Lori Greiner are “Sharks” on ABC’s “Shark Tank.” (Adam Taylor/ABC)

FINALE WATCH: “Nikita” (CW at 8 p.m.) Status: Renewed. The good news: The network left this show dangling for a while but finally gave it the green light for a fourth year last week. That bad news: It’s for a brief, six-episode final season. But on the plus side: That also means closure! In the Season 3 finale, thanks to Amanda, Nikita finds herself in a life-threatening situation and must choose between saving Michael’s life and her own. Meanwhile, the rest of the group tries to stop Amanda’s evil forces, although it proves to be a challenge.

FINALE WATCH: “Undercover Boss” (CBS at 8) Status: Renewed. Instead of focusing on one company, the reality show ends Season 4 by looking back at the most intriguing bosses featured throughout all four seasons, and exploring how the show affected their lives.

FINALE WATCH: “Shark Tank” (ABC at 8, 9) Status: Unknown, but likely to be back. We get two hours of the show Friday, which wraps up the fourth season at 9. In the last episode, the entrepreneurs are convinced that two business school graduates have come up with a great idea: an app for live translators for people traveling abroad.

Lori puts up with a lot on “Say Yes to the Dress: Atlanta” (TLC at 9), but she’s not happy when a bride marches in with not only her fiance but also their four children.

A business in Las Vegas wants a special aquarium to decorate an RV on “Tanked” (Animal Planet at 9), and as the team works to fill that order, they also throw out ideas for a tank that will hold alligators and sharks.

In the Season 3 finale, Nikita (Maggie Q) must make a decision to save Michael’s life or her own. (Sven Frenzel/The CW)

A New Orleans restaurant owner calls up Charles and the other “Mystery Diners” (Food Network at 9) for help when he feels that his staffers — mostly his family members — are being disrespectful on the job.

The owner of the Amargosa Opera House and Hotel in Death Valley Junction, Calif., is worried that ghosts will harm his business — a valid concern — so Steve and Amy help on The Dead Files” (Travel Channel at 10).

Council on Foreign Relations President Richard Haass is on “Real Time With Bill Maher” (HBO at 10), along with actor Zach Galifianakis; roundtable guests are commentator S.E. Cupp, filmmaker Michael Moore and journalist Andrew Ross Sorkin.

Actor Will Arnett, comedian Trevor Noah and musical guest Kurt Vile are on “The Late Show With David Letterman” (CBS at 11:35).

“The Tonight Show With Jay Leno” (NBC at 11:35) hosts Mitt Romney and the winner of “American Idol.”

Emily Yahr