年青考古學(xué)家安格斯。在女朋友瑪莉住的美斯農(nóng)場附近，發(fā)掘了一個類似蛇的頭骨，沒多久，瑪莉的父母失了蹤，而住在村里的神秘女士西維亞，又從外面回來，她是蛇妖的化身，捉了瑪莉的妹妹依芙，準(zhǔn)備將她奉獻給蛇妖。舉行奉獻儀式時，安格斯及時趕到，與蛇妖展開了一場決斗。 Scottish archaelogist Angus Flint discovers an odd skull amid the ruins of a convent which he is excavating. Shortly thereafter, Lady Sylvia Marsh returns to Temple House, a nearby mansion, far earlier than expected. At a party in the village, Angus meets Lord James D'Ampton, who has just inherited his family's lands, right next to Temple House. Angus learns of the D'Ampton Worm, a huge dragon/snake which an earlier D'Ampton killed by cutting it in half. (There's a pretty catchy rock-folk song that tells the D'Ampton Worm legend.) As people begin disappearing and acting strangely over the next day or two, the skull is stolen from Angus' room, and the watch of a missing person is found in a cavern which was the legendary home of the D'Ampton worm. Angus and James discover that there was an ancient cult which worshiped the worm as a god, and theorize that the creature somehow survived its "destruction", but was trapped inside the cavern. The remainder of the movie shows Angus, James, and Mary Trent attempting to stop Lady Marsh from freeing the creature...