生物化學專家明翰受警局顧問沃克教授推薦，協助警方調查不明水生物離奇殺人案件。開始眾人都深信是鬼神之說出來害人，明瀚不以為然堅信自己的判斷，隨著案件的偵破，明翰得知兇手就是他尋找多年的父親明智，當年父親和沃克教授一起秘密實驗時，不幸意外感染，變異成了今天肆意殺人的河童。 最終真相大白原來這一切都是沃克教授所為，為了利益他背著明智進行非法人體實驗，當明智不幸感染時，他不僅沒有醫治明智還把他當成了意外的驚喜，對他進行了人體試驗，導致明翰的母親無人照顧病死家中多日。最終父子二人聯手協助警方摧毀了這個犯罪組織。

　　音樂家西門(蔡楓華飾)生性風流不羈，乘帶領樂團赴韓演奏之便，探望開設跆拳道館之好友大口(王青飾)。大口投其所好，贊成他在韓國盡情開心，唯獨不能打其妹阿淑(李玄麗飾)主意。但機緣巧合之下西門巧遇阿淑，一見鐘情，阿淑更以身相許。誰知西門對阿淑只是抱玩弄心情，西門假稱要返香港，實則回到大口處向其炫耀其風流史。恰巧阿淑來到探望兄長，聞言傷心欲絕，大口卻氣到七竅生煙。淑獨自躲到雪山，西門冒雪崩危險尋覓阿淑。結果，兩人幾經艱辛脫險后，有情人終成眷屬。

　　The nightmare was about a demonic possession. A long time ago, there was an evil in a small town and it was jealous of the girl and would never let her go, since the devil loved the girl. One night, the evil raped the girl and she became pregnant. After months the girl could not hide her baby, her father figured her secret out and clapped the girl in irons and locked her room door. But the evil put the gun to her father' temple and saved the girl. The father had a stroke and had been sleeping on the bed for three months and died. Time went on and the girl brought a child into the world. Naturally, people who were living in the village heard the story and they did not want to see neither the girl nor the baby since when the baby was born, plants dried in the field, fishes lost in the lake and people had prayed to the god for rain, but nothing changed in the village. People got so angry, dug a hole in front of the fountain, put her into the hole and threw stones at her face. The girl died soon after. The evil went off the deep end, took a revenge of the village and killed everyone except two sisters because the evil wanted them to take care of its baby...

　　影片講述了一場震驚全國的特大運鈔車搶劫案發生后，嫌疑人小寶在無現場犯罪證明情況下金蟬脫殼，然而犯罪的種子已然在心中生根發芽，伴隨著時間野蠻生長，終將在警方的明察秋毫中爆裂迸發……