Storyline:
Sydney Bristow is a young, athletic, college graduate who was recruited her freshman year as a secret agent for SD-6, a top-secret branch of the CIA. After a few years -- after Sydney confides her lifestyle to her boyfriend, the evil head of SD-6 -- Arvin Sloan, has him killed. Sydney learns that SD-6 is part of a rogue international agency called the Alliance of 12, out to rule the world. She becomes a double agent, working with the real CIA to bring down SD-6 with the assistance of her handler, Michael Vaughn, and her estranged father Jack Bristow -- also a double agent. Along the way, Sydney fights various rival agents, rival terrorist groups, and traitors all the while keeping her cloak-and-dagger lifestyle a secret from her friends. (Season 1)

Cast:

Jennifer Garner Sydney Bristow

Ron Rifkin Arvin Sloane

Carl Lumbly Marcus Dixon

Kevin Weisman Marshall Flinkman

Victor Garber Jack Bristow

Michael Vartan Michael Vaughn

Greg Grunberg Eric Weiss

David Anders Julian Sark

Merrin Dungey Francie Calfo

Bradley Cooper Will Tippin