Despite its late start in January of 2005 after a hiatus of eight months, the fourth season of Alias more than made up for lost time with a plethora of trials, tribulations, jaw-dropping revelations, big-time betrayals, and near-death experiences for the series secret-agent heroine, Sydney Bristow (Jennifer Garner). Reeling from the disillusionment and embarrassment of her demotion, Sydney quits the CIA flat; however, it turns out that this is part of a master plan hatched by new CIA director Hayden Chase (Angela Bassett) to arrange Sydneys membership in Authorized Personnel Only (APO), a top-top secret black-ops organization. Sydneys co-workers at APO include several longtime associates: her father, Jack (Victor Garber); her partner and sometime lover, Michael Vaughn (Michael Vartan); her steadfast previous partner Dixon (Carl Lumbly) -- and, much to our heroines surprise, her duplicitous ex-chief, Sloane (Ron Rifkin), who has proven time and again that he cant be trusted. For her first APO assignment, Sydney is sent to Rio, where she has a fateful encounter with her latest adversary, Tamasaki (Rick Yune), a self-styled 21st century samurai. Previously a recurring character, Sydneys half-sister, Nadia Santos (Mía Maestro), becomes a full regular this season, the better to throw a monkey wrench into Sydneys volatile relationship with her father, Jack -- and to share with Jack a startling secret about Sydneys supposedly dead, supposedly traitorous mother. At the same time, Vaughn has a great deal of difficulty overcoming the treachery of his former wife, Lauren, and an equal amount of difficulty assimilating new and disturbing information about his own father. Major developments this season include a huge revival of interest in the Rambaldi code, which when broken may spell the doom of humankind; the surprising temporary recruitment of another of Sydneys longtime enemies, Julian Sark (David Anders), for a special APO mission; a grim prognostication that Sydney and Nadia are destined to duke it out to the death; and the resurrection of a long-presumed-dead central character, who will reveal anew to Sydney that she can never completely rely upon anyone or believe in anything, not even the evidence of her own eyes. Though the season ends with the good news that Sydney and Vaughn are engaged, any hopes for lasting happiness are dashed by still another shocking revelation -- and a spectacular car crash. ~ Hal Erickson, All Movie Guide