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 Ethan Hawke James Lennox Guest Star Olivia d'Abo Emma Wallace Guest Star Constance Brenneman Christine Phillips Guest Star Michael Mastro Arden Jezek Guest Star Bru Muller Hostage Negotiator Guest Star Steve Heinze Ranking Agent Guest Star Jenette Goldstein Medical Bay Technician Guest Star Michael Yavnieli C.I.A. Techie 2 Guest Star Joel Guggenheim C.I.A. Techie 3 Guest Star Ira Heiden C.I.A. Techie Rick McCarthy Guest Star Terry Walters C.I.A. Techie 5 Guest Star J.J. Abrams Executive Producer John Eisendrath Executive Producer Ken Olin Executive Producer, Director Roberto Orci Writer Alex Kurtzman Writer