Episode Title:False Identities.Episode Description:Claire meets an old friend of David's who is able to explain what happened in the past. Claire learns about her past but Martin and the others are suspicious about the friend and do not believe he can be trusted. There is more to her past than he revealed. Brodie's alias as Carswell is unveiled and it is revealed that he is a double agent working for the government to tackle the rifter threat. Brodie's health is failing and his time is limited...