杰克（安迪·萨姆伯格 Andy Samberg 饰）是一位精明强干的警探，被他所捕获的罪犯能排上好长一列，然而，在其他同事，包括他那新上任的上司雷（安德鲁·布劳尔 Andre Braugher 饰）眼中，一心追求“成绩”的他似乎有那么一些“不守规矩”。艾米（Melissa Gallo 饰）出生于警察世家，作为家中唯一一个穿上警服的女孩，她明白自己肩上背负着怎样的重担，有些时候，这重担压得她都有些喘不过气了。
泰瑞（泰瑞·克鲁斯 Terry Crews 饰）性格懦弱，至今还沉浸在妻子带着一对双胞胎女儿离他而去的痛苦之中。而查尔斯（乔·洛·特鲁格里奥 Joe Lo Truglio 饰）则陷入了对美女探员洛萨（斯蒂芬妮·比翠丝 Stephanie Beatriz 饰）那注定不会有结果的恋情之中无法自拔。
Having woken up in Hong Kong, with no memory for the last two years (!), Sydney returns to Los Angeles to try to piece together the last two years of her life and discovers the fates of her friends and family: Vaughn has married thinking that Sydney was l
Sydney finds herself face-to-face with her long-lost mother, Irina Derevko, whose intentions for her daughter are made chillingly clear. However, Sydney manages to escape and rejoin Jack and Will in their escape from Taiwan. After arriving back in Los Ang
表面上，雪莉（珍妮弗·加纳 Jennifer Garner 饰）是一名普通的大学研究生，实际上，她已为名为SD6的秘密情报组织工作多年。在同男友结婚之际，雪莉决定向其公开自己的真实身份，没想到男友却因此被组织的安全人员暗杀。愤怒中，雪莉选择了“罢工”，之后亦遭到了抹杀。危机之中，雪莉知道了自己的父亲杰克（维克托·加柏 Victor Garber 饰）也是和自己一样的秘密特工，并且，在背后扶持SD6的并非国家组织，而是拥有强大武力的反动分子。于私于公，雪莉和SD6都有着不共戴天之仇，她回到了SD6，但此时，
The expanded third season picks up six months after the events of season two and follows Lt. Joe Leaphorn and Jim Chee as they investigate the disappearance of two boys, with only an abandoned bicycle and blood-stained patch of ground left in their wake.
