Each week viewers see the gritty reality of life in a New York City Police unit as the officers go about their work with a grim determination. Two partners, Detectives Andy Sipowicz and John Kelley (later replaced by Bobby Simone), are the central characters in this weekly police drama, and personify very different approaches to their difficult job. Sipowicz's brash gruffness (covering an emotional vulnerability) is tempered by the precise and controlled demeanor of the two partners with whom he has worked.
在《复仇者联盟4：终局之战》的结尾，美国队长将盾牌交给了猎鹰（安东尼·麦凯饰），相信他能够继承美国队长的精神。此后，“猎鹰”萨姆·威尔逊和“冬兵”巴奇·巴恩斯（塞巴斯蒂安·斯坦饰）联合参与了一场全球性冒险行动，他们的能力和耐心受到考验 [39]。“美国队长”史蒂夫·罗杰斯卸任、灭霸被终结后，这个世界依旧不宁静。猎鹰继承了美国队长头衔之后美国政府对此心存抵触 [22]。“泽莫男爵”赫尔穆特·泽莫（丹尼尔·布鲁赫饰）似乎还要捣乱，猎鹰与冬兵出任务时还遇到了美国队长的前女友莎伦·卡特（艾米丽·万凯普饰） [1
