Jennifer Garner Sydney Bristow Actor Victor Garber Jack Bristow Actor Ron Rifkin Arvin Sloane Actor Michael Vartan Michael Vaughn Actor Carl Lumbly Marcus Dixon Actor Kevin Weisman Marshall Flinkman Actor David Anders Julian Sark Actor Greg Grunberg Eric Weiss Actor David Cronenberg Dr. Brezzel Guest Star Kurt Fuller Robert Lindsey Guest Star Dan Warner FBI Agent Reims Guest Star Daniel E. Smith Steven Dixon Guest Star Tristan Hays Robin Dixon Guest Star Boris Hamilton Customer Guest Star Erica Leehrsen Kaya Guest Star Susan Han EMT Guest Star Sarah K. Peterson Young Sydney Guest Star Mark Brahmall Andrian Lazarey Guest Star Jerry O'Donnell Agent Scrimm Actor J.J. Abrams Executive Producer John Eisendrath Executive Producer Ken Olin Executive Producer, Director Josh Appelbaum Writer Andre Nemec Writer