Here are ABC's description of the first few episodes.
Episode one and two
Authorized Personnel Only, Parts I and II
Sydney, Vaughn, Jack and Dixon are stunned by CIA Director Hayden Chase's (Angela Bassett) choice to be their new boss. Meanwhile, Sydney and Vaughn's possible reconciliation is surprisingly in doubt -- even though Lauren is dead -- and Sydney learns an appalling secret about Jack that threatens to destroy their relationship. Additionally, against Sydney's vehement objections, her new boss partners her with Jack to hunt down a modern-day samurai; Sydney's half-sister, Nadia, is reluctant to return to the spy game since learning the truth about her father -- Arvin Sloan; and Vaughn and Jack share a surprising bond over Jack's unspeakable past misdeed - much to Sydney's chagrin.
Episode three
The Awful Truth
To learn the location of a stolen NSA code-breaker, an undercover Sydney must convince a murderous arms dealer to fall in love with her. Meanwhile, Vaughn fears that Weiss might have been killed on a mission, and Sydney and Jack argue about telling Nadia the horrible truth about her mother, Irina.
Episode four
Ice
Sydney goes undercover as an earthy social worker and Vaughn as a lascivious, semi-tipsy priest to track down a deadly new bio-weapon. Meanwhile, Sydney is frightened when Vaughn's inner-demons regarding deceased wife Lauren come to the surface, and Nadia turns to a reluctant Jack to learn truths about her mother, Irina.
