Alias - Season 3 Episode 20 Blood Ties She can be anyone
Overview: After discovering the identity of the Rambaldi "Passenger," Sydney and Jack seek the aid of Sloane, to track the "Passenger" down. Meanwhile, after learning a secret about his father from Thomas Brill, Vaughn is kidnapped and tortured by Lauren and Sark, who are about to track "The Passenger" down themselves.