Carlos Gonzalez-Vio

Helena and her sister are reunited at the Castor camp when Sarah is captured. As Sarah suffers testing, Paul appears to hide her.

Mark is taken down in a Prolethean shoot-out and Sarah must step in to help. Alison and Donnie come face-to-face with Jason Kellerman.

Paul finds the truth behind the Castor Boys' logbooks of names, pushing him into action; Felix is desperate for info on Sarah's whereabouts.

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.

Mary and Catherine must conceal their identities when they encounter a mob of angry peasants; Lola wants to become financially independent.

When a former SRU cop shows up intent on committing suicide, the team must use every trick in the book on a subject who already knows them.