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 Kurt Fuller Robert Lindsey Guest Star Pruitt Taylor Vince Campbell , Schapker Guest Star Hector Atreyu Ruiz Guiding MP Guest Star Erick Avari Dr. Vasson Guest Star John Eric Bentley MP 2 Guest Star Pancho Demmings Security Station MP 1 Guest Star Richard Roundtree Brill Guest Star Robert W. Sudduth College Kid Guest Star Fred Saldone FEMA Guard Guest Star Javier Grajeda FEMA Supervisor Guest Star Travis Aaron Wade Security Station MP 2 Guest Star J.J. Abrams Executive Producer John Eisendrath Executive Producer Ken Olin Executive Producer Breen Frazier Writer Dan Attias Director