剧情：
Fivemonthslater.SydneyquitstheCIAandjoinsaBlackOpsunitcalled"AuthorizedPersonnelOnly"alongsideDixon,Jack,Vaughnand...Sloanewhomforlimitedimmunityisco-operatingwiththeAPO.Meanwhile,thetruthSydneyfoundoutinWittenbergendangersherrelationshipwithJack,andeventuallysherevealstheawfultruthtoVaughn:aboutherfatherhavingIrinamurderedoverayearearlier.