介绍：故事设定在《电锯惊魂》第一、二部之间，患病而绝望的约翰·克莱默（托宾·贝尔 Tobin Bell 饰）前往墨西哥进行一次危险的实验手术，希望能奇迹般地治愈癌症，却发现整个手术都是场骗局，旨在欺骗最弱势的群体抱持着全新目的后，“竖锯”，这位臭名昭著的连环杀手重操旧业，开始对付起这些骗子。

介绍：Moira Cole家人被残忍地杀害后努力地想要重建破碎的生活，但一切并不会那么容易，因为杀害她家人的正是与她拥有同样血脉的表弟

介绍：Straight-laced, type-A personality Joy Miles has to take an unscheduled road trip to drive her forgetful, yet opinionated, mother-in-law, Loraine, from Louisville, Kentucky to Savannah, Georgia. Although initially impatient and frustrated, Joy begins to realize her true affection for Loraine as she takes a front-seat-view of how this strong-willed yet free-spirited woman manages the emotional transition of learning to live life after losing her spouse. Despite their many differences, and with light-hearted adventures at every turn, they discover how much they respect and even need each other.

介绍：Moira Cole家人被残忍地杀害后努力地想要重建破碎的生活，但一切并不会那么容易，因为杀害她家人的正是与她拥有同样血脉的表弟

介绍：SWAT指挥官瑞格（莱瑞克•本特 饰）突然被绑架，卷入了一场致命游戏，他必须在一个半小时之内过关斩将，躲过一个比一个恐怖的陷阱，才能保住性命经验十足的FBI探员斯琼姆（斯科特•派特森 饰）来到被折磨得筋疲力尽的警察局，协助警探一起研究被竖锯玩死的受害者尸体，试图找出蛛丝马迹。随着调查的深入，竖锯变态的起因以及他邪恶的计划渐渐浮出水面……