With the aid of Katya Derevko and CIA imprisoned security systems designer Toni Cummings, Sydney and Vaughn attempt to track down Sloane and Nadia. But Lauren and Sark are also in hot pursuit of them in order to uncover the secrets of Rambaldi. Meanwhile, Vaughn's obsession with tracking down Lauren is beginning to consume him, Sydney and Vaughn turn the tables on an old foe, and Katya expresses her attraction to Jack.
Elenco: Jennifer Garner , Ron Rifkin , Carl Lumbly , Kevin Weisman , Victor Garber , David Anders , Michael Vartan , Greg Grunberg , Merrin Dungey , Bradley Cooper , Rachel Nichols , Lena Olin , Melissa George , Amy Acker , Johnny Trí Nguyễn .