Paul Campbell has joined NBC's new action series Knight Rider, Leven Rambin is in talks to board Fox's Terminator: The Sarah Connor Chronicles and Sophina Brown has been added to CBS' Numbers, according to The Hollywood Reporter.

On Knight Rider, which is a sequel to the 1980s NBC series, Campbell (Battlestar Galactica) will play the head research tech at Knight Industries.

On Terminator: The Sarah Connor Chronicles, Rambin (All My Children) will play the teenage Becky, a potential love interest for John Connor (Thomas Dekker).

On Numbers, Brown (Shark) will play Nikki Donat, an ex-LAPD officer and full-blown adrenaline junkie who joins the Los Angeles FBI team as a junior agent. Brown, whose role is recurring with the potential of becoming regular, is expected to fill the void left by the departure of Diane Farr.