What's New Tonight: Friday, May 17th.

8:00 PM EST:

“Nikita” on The CW. Season 3 Finale. Amanda puts her final plan into effect, placing Nikita into danger, forcing her to choose between saving Michael or herself. The team tries to stop Amanda, but fear she might have them outgunned due to their diminished Division.

“Undercover Boss” on CBS. Season 4 Finale. A look back at some of the most intriguing bosses from the past four seasons. Also features a retrospective; see how Undercover Boss has impacted their lives and see where they are now.

“WWE SmackDown” on SyFy. Jericho, Randy Orton, and Big Show host a highlight reel as their countdown to Extreme Rules continues.

9:00 PM EST:

“Da Vinci’s Demons” on STARZ. The spy search heats up. Using the clue from the Turks, Leonardo is lead to Wallachia where he encounters Vlad Dracula. Lorenzo and Piero have a run in with the Duke of Urbino.

“Sons of Guns” on DSC. The gang builds an MG-34 machine gun.

“Shark Tank” on ABC. Season 4 Finale. Two business school grads have an idea for a translation app. An eleven-year-old has an idea for all-natural dog treats. A busy single mom hopes to draw some attention for her dating site. Two friends hope for financial help for their grilled cheese franchise. Also features an update on Ice Chips.

10:00 PM EST:

“Fashion Police” on E!. Featuring the model Lily Aldridge.

“Merlin” on SyFy. A past flame comes back into Mordred’s life, testing his loyalty to Arthur.

“Mystery Diners” on FOOD. The owner of R&O’s in New Orleans calls for Charles. The owner fears he’s being disrespected by his staff, which consists mainly of his family members.