一条庞大的蛇从实验室逃亡之后潜入城市下水道之内，并伤害许多无辜的人，已对整个城市构成威胁和恐慌。联帮调查局官员和科学家决定使用最原始的办法--以暴制暴来铲除大蛇，科学家将一枚芯片置入一条蟒蛇脑中，只允许躇蛇看见逃亡下水道的…

　　To escape a serial killer, a single mom and her daughter enter witness protection, only to find their lives in greater danger than ever.