正值青春期的少女艾瑪（蘇菲·瓦瓦希爾 Sophie Vavasseur 飾）因小事與父母發生爭吵，繼而用玻璃碎片割破自己的手掌。在此之后，父母子女的關系雖有所松動，但是新的危機已悄悄展開。艾瑪是不是會做出些奇怪的舉止，這令父母異常擔心，于是只得將艾瑪留在家中接受教育。期間他們嘗試帶女兒去看具有催眠本領的心理醫生，誰知醫生最終猝死艾瑪的膝上。艾瑪自感自己已被魔鬼附體，因此不顧崇尚科學的父母的反對，執意求助于因驅魔失敗而被革除神職的舅舅基斯（道·布萊德利 Doug Bradley 飾）。　　基斯似乎漸漸證實了艾瑪的猜測，而她體內那股邪惡的力量也變得越來越強大……

　　死黨阿華，師爺仔及飛牛三人分別任職于會計，律師樓及警員。他們均喜歡包租婆的女兒蒙珠。一日，阿華知道會有巨額運抵公司及發現有賊人已鋪好路線偷款。于是將計就計，他們預先偷走巨款，然后嫁禍給劫匪。雖然錢得手，但全是廢紙，而煩惱才剛剛開始……

　　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...

　　豐國商事在北海道紋別地區一直進行著森林采伐，作為現場監督人員的后藤裕一無意中發現了隱藏在這片森林之 中的古代遺跡并將埋藏在這片遺跡中的一枚盾牌拿了回去。　　其實這片遺跡是妖精族留下來的，在此地還 封印了一個叫做帝斯基多拉的宇宙怪獸。6500萬年前從外星而來的它毀滅了一切植物，導致了恐龍滅絕，而那枚盾牌正是用來封印怪獸帝斯基多拉的。　　對此毫不知情的裕一將這枚盾牌帶回了位于都內自己的 家并把它作為掛飾送給了自己的女兒，然后自己又返回到了采伐現場。黑色妖精貝拉貝拉飛來搶奪這枚盾牌并與對立派莫兒、羅拉姐妹展開了盾牌爭奪戰。在被莫兒、羅拉姐妹告知盾牌和封印的由來的后藤一家與莫兒、羅拉姐妹一起準備前往紋別。但在紋別的卻出現了一塊巨大的巖石。在后藤一家的協助之下羅拉姐妹奪回了盾牌，但是怪獸帝斯基多拉卻從巖石中復活了。它像惡魔一樣恐怖。為了打到怪獸帝斯基多拉，莫兒召喚來了摩斯拉。但是摩斯拉剛剛產完卵，壽命不長的她和怪獸之間陷入了苦戰。為了助自己母親一臂之力早產的 幼蟲通過自己的絲和光線支援母親作戰。　　摩斯拉不斷挑戰怪獸，使水庫決堤成功的將怪獸逼到了對岸，但是摩斯拉拼盡了全力最終沉入了海底。在這之后，幼蟲在屋久島充分吸收了森林的能量新的摩斯拉再次誕生了。于此同時怪獸也已經重新恢復到毀滅地球時的完 全狀態，新的摩斯拉與怪獸再次交戰，他以壓倒性的力量和優勢再次將怪獸封印到了地下。此后，摩斯拉讓被怪 獸燒掉的已成荒蕪的北海道瞬間重獲綠色，并和莫兒、羅拉姐妹一起返回到了家鄉。