Nikita

Michael and Nikita are ready to use the black box's contents to take down Division and Oversight; Amanda asks for Alex's help with a mission.

Nikita and Michael run into Owen while investigating an old Division program.

Birkhoff tells Nikita and Michael that a former international terrorist now works for Division; Alex agrees to try and kill a man who used to work for her father.

Nikita is shocked to learn her former Division partner, Kelly (Katheryn Winnick), is still alive and has escaped a Turkish prison; Amanda tries to stop Kelly and Nikita from reuniting.

Michael finds out a woman he once seduced as part of an assignment is in danger; he wants to help; Amanda gets Alex to help her on a mission; Sean starts to doubt Division's motives.

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.

While in prison, Ryan makes a discovery and tries to alert Nikita; Alex encounters someone from her past.

Michael helps Cassandra after hearing General Tupelov will kill her unless she returns money she allegedly stole, but Nikita is suspicious; Alex receives an offer from Percy that could help her eliminate Semak.

A plan to identify the members of Oversight goes awry when Sean captures Birkhoff; Alex tries to get back into Russia.

Nikita asks Owen to help her steal another black box; Amanda is furious when she realizes Alex received information from Percy; Alex moves in on Semak.

During her hunt for Gogol, Alex returns to her childhood home and confronts ghosts from the past; while on a mission, Nikita crosses paths with Alex; Owen and Shane try to determine Percy's secret plan.

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

When Percy holds Oversight members hostage until Amanda gives into his demands, Nikita must decide if she wants to help; Sean frantically tries to save his mother.

Percy threatens to kill Nikita's mentor.

Michael and Nikita try to help Carla (Erica Gimpel) remember her past in hope of recovering information that could take down Division; Alex makes an announcement at a Zetrov press conference.

After a series of Division agents are assassinated, Amanda discovers that Percy is behind the murders; Nikita receives a tempting offer.

When Michael learns Cassandra has been keeping a secret, he and Nikita go to Moscow to confront her; Alex sends out a coded message, hoping to find her mother.

Amanda and Ari arrange a board meeting with Zetrov and prepare to take over; Nikita remembers what Amanda used to be like; Alex surprises Ari with an old friend.

When a man Nikita once apprehended is released, he seeks revenge; Percy plays games with Sean, Alex and Michael.

Nikita talks Birkhoff into using $20 million of his own money to lure Percy into a trap; Birkhoff is arrested.

Ryan wants to go to the CIA director for help when Percy's nuclear weapon plan appears to be getting out of control; Alex is shaken when Sean is shot.

Percy threatens to set off a nuclear explosion unless his demands are met; Nikita decides the best way to stop Percy is to go into Division.

Michael and Nikita infiltrate Division in hope of capturing Percy; Sean and Alex are caught in a gunfire battle; Birkhoff seeks help from Sonya.