萬圣節前一天，五名狂歡節員工被綁架挾持到一個稱為“肅殺世界”的孤立院子。在萬圣節時，他們會被扔進一個名叫“31”的虐待狂的游戲中，他們將面對一群穿得像小丑一樣的瘋子。然而，小丑并不是唯一需要擔心的，一個更宏大的邪教儀式和更殘酷的陰謀將被喚醒......

　　Shipwreck survivors are found on Beiru Island (Infanto t?), which was previously used for atomic tests. The interior is amazingly free of radiation effects, and they believe that they were protected by a special juice that was given to them by the island's residents. A joint expedition of Rolisican and Japanese scientists explores Beiru and discovers many curious things, including two women only one foot (30 centimeters) high. Unscrupulous expedition leader Clark Nelson abducts the women and puts them in a vaudeville show. But their sweet singing contains a telepathic cry for help to Mothra, a gigantic moth that is worshiped as a deity by the island people. The giant monster heeds the call of the women and heads to Tokyo, wreaking destruction in its path.

曾經為國家而戰的男人，如今必須對抗來自內部的敵人，才能守護自己的家園與家人。

　　大婚之夜，太子獨自喝醉，留下姚芊芊盛裝獨坐到天亮。太子本宣蘭心侍寢，卻傳來畫室失火的消息，太子走后，蘭心因為擔心張清遠也尾隨而去，卻被張清遠告知火是他放的，兩人終于決定私奔。梅兒故意告知蘭心私奔的錯誤時間，致使蘭心在雪中凍了一夜，被太子發現救回。　　姚芊芊跟鄭貴妃抱怨遭冷落，正逢三皇子前來，兩人暗通款曲并有了身孕。為了掩飾，她不得不通過鄭貴妃向王恭妃施壓，使得太子終于與她圓房，并擇定時間宣布自己有孕。　　金碧瑤因被姚芊芊掌摑而與蘭心、梅兒交好，并告知從姚芊芊處偷取了可助懷孕的藥，梅兒因為想爭寵而不顧蘭心勸告將藥粉放入酒中并讓太子喝下，太子卻突然倒下，蘭心趕到并宣太醫醫治，原來，藥粉是一種媚藥，若與酒一起服用便可致人于死地。王恭妃勃然大怒，下令搜府，卻從蘭心處搜出藥粉。原來，一切都是姚芊芊與金碧瑤的詭計。而金碧瑤也因為太子中毒認清了姚芊芊的真面目。　　鄭貴妃拷打蘭心，逼她簽寫敗壞太子聲譽的供詞，蘭心誓死不從。關鍵時刻，太子及時趕到并帶走蘭心，卻在路上暈倒，蘭心感動不已。　　姚芊芊收買了丫鬟向張清遠報信，讓他以為蘭心被太子害死，并用調虎離山計調離了蘭心。蘭心在路上感覺不對，匆匆往回趕，正好看見張清遠持刀向太子刺去。蘭心以身相代，并控制不住問張清遠為何不守信約，張清遠卻因為刺中蘭心而心神恍惚。太子終于知道了蘭心眼中的憂郁從何而來，又為何獨自在雪中待了一夜。　　蘭心幸好沒有被刺中要害，活了下來。太子正想審訊張清遠，卻已發現張清遠吊死在橫梁上，并留下了給蘭心的生死訣別書。