After discovering that the Rambaldi Passenger is her half-sister, Nadia, Sydney and Jack seek the aid of Nadia's father, Sloane, to track her down. Vaughn is kidnapped and tortured by Lauren and Sark.
original airdate--April 25,2004 rating--8.25 million
music--Theme song composed by J.J. Abrams performed by Charles Fernandez
Trivia--First appearance in the series of MÃa Maestro as Nadia Santos, Sydney's sister