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.