节目历经三季，本季继续聚焦长沙解放西繁华商圈的警察工作日常，展现繁华都市的守护者群像。第四季节目将迎来全新的守护者联盟，由新任所长带领新一批的“三高”民警，同交警组、水警法医组、特巡警组等，不分时段、不分地域、不分人群，全力维护着城市秩序，保护着每一个人，共同守护解放西的繁荣和安全。

　　When 18-year-old Johanna comes home from school, her miserable father hides behind drawn curtains. He can't manage buying food, paying the electric bill, or support his daughter, who instead plods over to the pawnshop with her slalom skis after the unin

24-years old Ellen always had trouble to finish what she started and decide to finally get the high school diploma she never got. But to do that she got to pretend to be 16, something that is turning out to be much harder than she expected.

　　珀尔杰森是丹麦飞碟协会的成员，他曾经为了接近心爱的姑娘苏珊而接受宇航员培训，对航天一窍不通的他考核失败，作弊的事情又被苏珊发现，两人分道扬镳。 　　多年后，丹麦大富翁库尔特玛加以保护环境之名，声称要投资赞助土星之旅的航天计划。在出发前，航天队的领航员病倒，库尔特不顾技术顾问苏珊的反对，执意任命珀尔担任领航员的职务。在退伍老兵阿恩的率领下，这支极不专业航天队向土星进发。当他们抵达目的地时，却被当地的生物所抓获。不久，他们更得知这次土星之旅背后真正的目的……