Alias Sydney Bristow is not your average college student - she has a secret life working as an agent for the CIA, or so she believes. When she discovers that the agency she is working for (SD6) is plotting against the CIA, she becomes a double agent, helping her farther (also a double agent) to disrupt SD6 plans at every opportunity. Cast Jennifer Garner as Sydney Bristow Victor Garber as Jack Bristow Michael Vartan as Michael Vaughn Ron Rifkin as Arvin Sloane David Anders as Mr. Sark (aka Julian Lazarey) Carl Lumbly as Marcus Dixon Kevin Weisman as Marshall Flinkman Melissa George as Lauren Reed Bradley Cooper as Will Tippin Merrin Dungey as Francie Calfo & Allison Doren Lena Olin as Irina Derevko Mía Maestro as Nadia Santos Rachel Nichols as Rachel Gibson Balthazar Getty as Thomas Grace Tyrees Allen as Gordon Dean Amy Acker as Kelly Peyton