Jennifer Garner Sydney Bristow Actor Victor Garber Jack Bristow Actor Ron Rifkin Arvin Sloane Actor Michael Vartan Michael Vaughon Actor Carl Lumbly Marcus Dixon Actor Kevin Weisman Marshall Flinkman Actor Balthazar Getty Thomas Grace Actor Rachel Nichols Rachel Gibson Actor Élodie Bouchez Renee Rienne Actor Amy Acker Kelly Peyton Guest Star Mía Maestro Nadia Santos Actor David Anders Julian Sark Guest Star Greg Grunberg Eric Weiss Actor Kathe E. Mazur Dr. Lynn Guest Star Joel Bissonnette Keach Guest Star Tyrees Allen Gordon Dean Guest Star Shaun Duke Moosekian First Man Guest Star Angus Macfadyen Joseph Ehrmann Guest Star David Pressman Walsh Guest Star Lena Olin Irina Derevko Guest Star J.J. Abrams Executive Producer John Eisendrath Executive Producer Ken Olin Executive Producer, Director Alison Schapker Writer J.R. Orci Writer Andi Bushell Writer Drew Goddard Writer Breen Frazier Writer Josh Appelbaum Writer Jeffrey Bell Writer, Director Jesse Alexander Writer Sam Humphrey Writer Monica Owusu-Breen Writer Frederick E.O. Toye Director Tucker Gates Director Karen Gaviola Director Jay Torres Director Andre Nemec Writer