Shifting Gears may be going through a shakeup after Jenna Elfman, who plays Tim Allen's girlfriend, booked a new role. Deadline reported on Tuesday, May 5, that Elfman, 54, joined Fox's The Interrogator as a series regular opposite Stephen Fry, Luke Kleintank and Michael Beach. The project has already received a 12-episode and straight-to-series order According to the synopsis, Fry will play a former MI6 agent Conrad Henry.