(Jennifer Garner)

A former protege of Chris, Vivian Taylor may have succumbed to the dark side of her nature and thrown in with the villains, but after they double-crossed her she finally saw the error of her ways, starting a one-woman crusade to destroy Parker's operation - which brought her back into the fold of Chris' team.

Initial tensions with Twist soon faded as Vivian proved her worth again and again, her inside knowledge of Parker's operation making her a key part in halting his Zero Tolerance campaign and getting the team close enough to tackle the doctor face to face. But with her nemesis gone, what now for the reformed vampire?