Alias - Season 3 Episode 18 -

Sydney and Jack warn a disbelieving Vaughn about their suspicions of Lauren being the CIA mole. Meanwhile, Kazari Bomani and Sark take possession of the Rambaldi machine as part of their greater master plan. Sydney and Vaughn must stop a Covenant virus that's crippling medical facilities around the world. Sloane's secret of being Sydney's biological father is revealed to Jack, and Bomani begins to lose faith in Lauren's ability to carry out her Covenant missions.