Jenna Elfman is the latest addition to the cast of the upcoming Fox series “The Interrogator.” Elfman will appear alongside series lead Stephen Fry in the show as well as fellow cast members Luke Kleintank and Michael Beach. The series was originally announced in February with a straight-to-series order for 12 episodes. The logline for “The Interrogator” states that it centers on “MI6 agent Conrad Henry (Fry) and his elite team. When conventional methods have failed, Henry’s quirky charm, superior intellect and mind-bending behavioral maneuvers make him the only man able to lockpick the minds of the world’s most dangerous criminals.” Popular on Variety Elfman will appear in the series regular role of Woodrow. The character is described as someone who “was a rising star in the CIA, until a mission gone awry sent her tumbling down the ladder. Now she finds herself at the D.I.A. as a handler for Henry’s group. She sees it as a demotion — the first step on her climb back up to where she fell from.…