The Venture, an old trident nuclear submarine retrofitted for research, has picked up an ancient and powerful artifact off the ocean floor and brought it aboard. Called the Hades Stone, it allows the dead to pass through a portal into the world of the living. No one has entered the portal, but evil things have emerged: phantoms, demons, and an ancient being known as the Stone Keeper, guardian of the Hades Stone. The Stone Keeper and his stone demons promptly attack, killing the entire crew and commandeering the submarine. Now, it is up to the elite Phantom Force team to stop him.

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大蛇.同时,一群为了赚钱的猎人也正在尝试使用各种方法来杀蛇，然而，此大蛇也有着非常的智慧，甚至有它的阴谋--报复人类，连蟒蛇也不能将它制服……