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 Melissa George Lauren Reed Actor Greg Grunberg Eric Weiss Actor David Anders Julian Sark Actor Mía Maestro Nadia Santos Guest Star Isabella Rossellini Katya Derevko Guest Star Cotter Smith Hank Foster Guest Star Jordi Caballero The Plumber Guest Star Michael Guarnera Agent Guest Star Burt Bulos Safe House Agent Guest Star Andrea Lwin EMT Guest Star Kendall Clement Hospital Guard 1 Guest Star Eddie Diaz Hospital Guard 2 Guest Star Roland De La Maza E.R. Doctor Guest Star Ed Brigadier Reynard Kauffman Guest Star Cosimo Canale Covenant Foreman Guest Star J.J. Abrams Executive Producer John Eisendrath Executive Producer Ken Olin Executive Producer, Director Jeff Pinkner Writer