Unveiled is the 18th episode of Season 3 of Alias, and the 62nd episode overall. Sydney and Jack warn a disbelieving Vaughn about their suspicions of Lauren being the Covenant mole inside the CIA. Meanwhile, Bomani and Sark take possession of the Rambaldi machine, Sydney and Vaughn must stop a Covenant virus that's crippling medical facilities around the world, Sloane's secret is revealed to Jack.