As season four of the action series continues, Nikita's wits and ingenuity keep her alive in a pressure-cooker environment. Under the tutelage of her mysterious mentor, Michael — who becomes her lover — Nikita has transformed into a highly trained agent fighting global terrorism by any means necessary. She may not always make the right choice, but she never loses her sense of self — even after Section One brainwashes her and it's up to Michael to reverse the experimental process. Meanwhile, Operations prepares for a looming full-scale war between the Section and its shadowy monitoring organization, Oversight. With the potential destruction of Oversight's leader, ultimate power beckons to Operations — if it doesn't blow up in his face. Recurring guest stars include Carlo Rota (24) as Nikita's neighbor, Mick, and Sian Phillips as Adrian, the founder of Section One. Aaron Ashmore (Smallville), Maxwell Caulfield (Emmerdale Farm, Grease 2) and a young Michael Cera (Juno) also guest star.