Blood Ties is the 20th episode of Season 3 of Alias, and the 64th episode overall. 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 Sark, who are about to track "The Passenger" down themselves.