Nikita and Michael plot to take down Division and Oversight. Amanda, who is now running Division, enlists Alex's help to stop them.

Nikita and a reluctant Michael join forces with Owen, who is searching for the mastermind behind the Regimen.

Amanda convinces Alex to kill a man who used to work for Alex's father. But when Nikita disrupts Amanda's plan, Amanda fights back and takes what Nikita loves most.

Nikita is stunned to hear her old Division partner Kelly has escaped from a Turkish prison, having believed Kelly died when Nikita fled Division.

Michael wants to help a woman he once romanced under Division orders, who is in danger.

After Birkhoff finds Nikita's birth certificate, Nikita and Michael track down her father. Percy tells Alex the black box could help her avenge her father's death.

Amanda intercepts messages between Nikita and Ryan, who is in prison and has learned how Oversight is funded.

Michael helps Cassandra after hearing General Tupelov will kill her unless she returns money she allegedly stole, but Nikita is suspicious.

Sean captures Birkoff and when he won't reveal where Nikita is hiding, Amanda tortures him.

Nikita turns to Owen to help her track down another black box, but discovers Owen is working for an unlikely employer that could jeopardize her whole operation.

Alex's mission to take down Gogol comes to a head as she infiltrates her childhood home and faces ghosts from her past.

Sean attacks Nikita and Michael to protect his mother. Percy gets the upper hand on Amanda and threatens to level Division unless she releases him.

Nikita must decide if she will try to save Division. Sean turns to Nikita, Michael and Alex for help.

Percy threatens to kill Nikita's mentor, so she uses Madeline to send a message. Amanda tells Alex it's time to reveal Alexandra Udinov to the world.

Nikita is shocked by what Carla recounts of the night Nikita was arrested. Alex shows up at a Zetrov press conference to make an announcement.

Amanda reluctantly offers Nikita a deal: Stop Percy from murdering Division's agents and Nikita can have Ryan.

Michael is furious when he discovers a secret that Cassandra kept from him. Alex makes a last-ditch effort to find her mother.

Amanda and Ari prepare to take over Zetrov. Alex surprises Ari by showing up at the board meeting with an old and powerful friend.

Nikita is captured and tortured by someone she previously targeted, and Percy continues to play mind games with Michael, Alex and Sean, pushing one of them to the brink of death.

After losing his life savings to Percy via a plan gone wrong, Birkhoff hacks into an old network which trips a trap set by the FBI.

Nikita opposes Ryan's plan to go to the CIA and is surprised when Michael takes Ryan's side. Sean is shot by Percy's men, shaking Alex to the core.

Percy threatens to set off a nuclear explosion unless his demands are met. Nikita realizes the best way to stop Percy is to go into the belly of the beast: Division itself.

Nikita and Michael invade Division in an attempt to capture Percy, and Alex and Sean get caught in a deadly gunfire battle with the U.S. Marines.

A troubled teenager, Nikita, was rescued from death row by a secret U.S. agency known only as Division.

Percy and Michael take their latest assignment into protective custody, but Nikita finds their hideout and attempts to thwart their plan.

Nikita rescues Jill a journalist trying to expose a conspiracy involving Division and a major plane crash.

Nikita revisits her past when she posed as a nanny for an influential government official and decides to right the wrong of his death.

Division operative Owen escapes from a bank robbery and becomes a fugitive. Alex attempts to warn Nikita, but she is busted by Thom.

Division recruits are attacked by terrorists who kidnap Alex and Thom, both of whom are unaware that this is a test by Division.

Alex informs Nikita that one of the recruits has been activated to carry out a suicide mission.

If a U.S. senator agrees to help pass a bill that will continue to fund Division, the agency will cover up the senator's secret affair.

Nikita and Michael temporarily team up to kill a terrorist. Alex is caught going through medical files inside Division and creates a lie about Jaden, almost blowing her cover.

Percy frames a C.I.A. agent, Ryan. Nikita and Owen go to Chile in an effort to rescue Ryan from mercenaries, but they end up getting captured.

Alex is sent on her first kill mission. Birkhoff discovers the shell program that has been used to connect to Nikita in the outside world. Nikita is captured by Division.

Nikita realizes Division has implanted a kill chip in Alex's head, who is now an agent, given a cover job and invited to a party by her new neighbor, Nathan.

A plan to foil Alex's first assassination assignment goes awry when Nikita trusts the wrong person. When Division is alerted that Nikita is near, Percy sends Michael to kill her.

To help Ryan with a mission, Nikita must resume an old identity she had while undercover at Division.

While out on a mission, Alex runs into Irina, a woman from her past, and tries to help her. When Irina double-crosses Alex, it's she who needs saving.

Alex is sedated to help her heal after her last mission, but Amanda takes advantage of Alex's drugged condition to question her.

Michael confronts Nikita and reveals that he knows Alex is the mole. He gives Nikita 24 hours to find the man who killed Michael's family, or he will tell Percy about Alex.

Nikita goes to London with Owen to retrieve one of Percy's black boxes; there, the two disagree about what to do with it.

Alex and Jaden are assigned an overseas mission, but when things go awry, Alex must decide whether to try and save the mission ... or herself.

When Nikita goes to a small town after one of Percy's black boxes, she is shocked to find the guardian of the box has abandoned her post and is attempting to live a normal life.

Michael sends Nikita in to save the last person on the list of black box protectors, a CIA cryptographer named Malcolm.

Percy makes a move to take over the CIA, Alex goes rogue and Michael is trapped inside Division, unable to help Nikita when her life is in peril.

Nikita finds herself alone and on the run, framed for assassinating the President. Following a lead that could clear her name, she's reunited with her team.

Ryan realizes Amanda is making doubles of VIPs. One is the director of the FBI, but Nikita doesn't know how to kill him without exposing herself.

The CIA captures Alex and questions her about Nikita. Ryan becomes suspicious of Birkhoff's odd behavior and tells Nikita and Michael his thoughts.

The Shop offers Nikita and her team freedom. Sam contemplates an opportunity to recoup his losses. Michael comes face to face with an old adversary, Ramon.

Just as Nikita is finally starting to see an end to the long war with the Shop, Ryan confesses a secret that could unravel it all.

A frustrated Nikita takes Alex on the road to exact revenge and, ultimately, makes a shocking decision.

Ryan takes charge of Division with Nikita by his side. Their first mission is to bring in "The Dirty Thirty," rogue Division agents still at large.

Nikita, Michael and team try to find a young girl who was brainwashed by a rogue Division agent.

When Ryan tells Nikita an undercover agent has been arrested and they need to extract her from prison, Nikita questions why Division is continuing to run Percy's old missions.

Amanda sends a rogue Division agent, Anne, to get Owen from a Russian prison, but Owen escapes and returns to Division with Nikita. Can Michael and Ryan trust Owen?

Ryan admits Division is in trouble and Nikita and Michael are furious this was kept from them. Alex and Owen are caught in an explosion, and think it was set up by an insider.

When an arms dealer is captured, he is used as bait to lure Amanda. Meanwhile, Birkhoff is hot on the trail of Amanda's mole and Alex starts to unravel.

Nikita, Michael and Ryan devise a plan to use Sonya to ferret out Amanda's hiding place. Michael confronts Alex about her drug use.

Michael and Nikita's relationship is strained as Nikita and Owen team up against a rogue "cleaner" named Liam.

Ryan dispatches the team to rescue a woman kidnapped by a rogue agent. Nikita is confused when Michael sends Owen into the field with her.

Michael resumes his role inside Division. Michael, Alex and Ryan follow Nikita into Kosovo on a dangerous mission, but the outcome has far-reaching consequences for Division.

After Amanda frames Sean for murder, Nikita comes up with a plan that could either save him or cost him his life.

Ari seeks help from Division and Nikita and Michael are stunned when Ryan considers it. Sean is jealous of Alex and Owen's relationship.

When Nikita and Amanda are both captured, the two must work together to escape. Owen is furious with Michael after Michael assigns Alex to be Nikita's backup instead of him.

Amanda holds Alex hostage and tells Nikita she will release Alex in exchange for Ari. In captivity, Alex befriends a fellow prisoner, Larissa.

Nikita decides Division should take on a government mission in Paris. Alex and Birkhoff are shocked when they come across a secret so big it could blow up Division -- literally.

Nikita and Michael learn of a new prosthetic hand that could have Michael back to his old self, but it comes at a steep price.

Alex confesses to Birkhoff her desire to leave Division. Amanda begins providing Owen with something he was never able to find -- memories of his real past.

Subjected to Amanda's horrific mental conditioning process, Nikita is sent on a terrible trip through memory lane. In the process, she learns Amanda's deepest, most guarded secret.

Dirtied with Division blood and destruction, an emotional Alex reverts to old ways and violently strikes out. Birkhoff struggles with his own personal losses.

Nikita, Michael, Alex and arms dealer/reformed rogue agent Cyrus stage a daring operation at the tightly secured G20 economic summit.

Michael questions Nikita's commitment to a life beyond Division's web -- and he's not the only one with doubts.

Amanda puts her final plan in motion and forces Nikita into a life-threatening situation where she has to choose between saving Michael ... or saving herself.