Jennifer Garner Sydney Bristow Actor Victor Garber Jack Bristow Actor Ron Rifkin Arvin Sloane Actor Michael Vartan Michael Vaughn Actor Lena Olin Irina Derevko, Laura Bristow Actor Bradley Cooper Will Tiffin Actor Merrin Dungey Francie Calfo Actor Carl Lumbly Marcus Dixon Actor Kevin Weisman Marshall Flinkman Actor David Anders Julian Sark Actor Terry O'Quinn F.B.I. Assistant Director Kendall Guest Star Greg Grunberg Eric Weiss Guest Star Rutger Hauer Anthony Geiger Guest Star Elizabeth Penn Payne Techie 1 Guest Star Ira Heiden C.I.A. Techie Rick McCarthy Guest Star Jean-Pierre Bergeron Gils Nacor Guest Star Angus Scrimm Calvin McCullough Guest Star Kevin Sutherland Techie 3 Guest Star Mark Galasso Tactical Medic Guest Star Lyle Kilpatrick Police Officer Guest Star Alex Morris Homeless Vet Guest Star J.J. Abrams Executive Producer, Writer John Eisendrath Executive Producer Ken Olin Executive Producer Jack Bender Director