影片将故事背景设定在20年后的未来世界，故事从一家野味饭店开始讲起，一群贪婪的食客们本来打算享受一顿野味大餐，暴怒的变异巨蜥却冲破铁笼成为了真正的猎食者，故事创作团队以夸张的手法，以巨大的变异生物喻指环境污染后出现的种种危害。在影片中，善良的捕鼠专家阿发历经重重困难，终于制服了巨蜥，贪婪的食客们也得到了应有的惩罚。

影片讲述阿发和三叔经营的“害虫克星”的灭鼠公司，误打误撞受丽晶大酒店所托前来灭鼠，就在探查老鼠行踪之际，他们偶然发现楼下酒家竟违法经营山珍野味供大款进食，猎人大龙将不知名“蜥蜴”带来酒店，在“蜥蜴”的肆掠下酒店店员一个接一个神秘失踪，一场惊心动魄“灭虫”之旅即将展开......

明代，皇家选秀。富户俞仁嫌婿张少莲家贫，逼其退婚，令女应选。女素秋与母计议，取玉钏一对，命丫环鸾英送一只去张家，以为迎娶之资。张友韩臣冒名进府，骗奸素秋。恰逢江海入室盗窃，杀死俞母和鸾英，劫走另一玉钏。少莲蒙冤入狱，素秋方知被骗失身，遂羞愤自尽。江海售卖玉钏于街巷，偶遇韩臣之妹玉姐，闻知韩亦有玉钏一只，乘机窃得，却被公差擒获。御史陈智审理积案，发现疑点，乃传唤韩臣。玉姐随兄上堂，实言佐证，令真相大白。玉姐爱慕少莲，自荐为妻。陈智撮合，二人成婚。

明代，皇家选秀。富户俞仁嫌婿张少莲家贫，逼其退婚，令女应选。女素秋与母计议，取玉钏一对，命丫环鸾英送一只去张家，以为迎娶之资。张友韩臣冒名进府，骗奸素秋。恰逢江海入室盗窃，杀死俞母和鸾英，劫走另一玉钏。少莲蒙冤入狱，素秋方知被骗失身，遂羞愤自尽。江海售卖玉钏于街巷，偶遇韩臣之妹玉姐，闻知韩亦有玉钏一只，乘机窃得，却被公差擒获。御史陈智审理积案，发现疑点，乃传唤韩臣。玉姐随兄上堂，实言佐证，令真相大白。玉姐爱慕少莲，自荐为妻。陈智撮合，二人成婚。

Set in Dublin (a rather surprising giallo setting), Iguana opens audaciously with an acid-throwing, razor-wielding maniac brutally slaying a woman in her own home. The victim's mangled corpse is discovered in a limousine owned by Swiss Ambassador Sobiesky (Anton Diffring, Where Eagles Dare) and a police investigation is launched, but when the murdering continues and the ambassador claims diplomatic immunity, tough ex-cop John Norton (Luigi Pistilli, A Bay of Blood) is brought in to find the killer…

Set in Dublin (a rather surprising giallo setting), Iguana opens audaciously with an acid-throwing, razor-wielding maniac brutally slaying a woman in her own home. The victim's mangled corpse is discovered in a limousine owned by Swiss Ambassador Sobiesky (Anton Diffring, Where Eagles Dare) and a police investigation is launched, but when the murdering continues and the ambassador claims diplomatic immunity, tough ex-cop John Norton (Luigi Pistilli, A Bay of Blood) is brought in to find the killer…

一群年轻的大学生策划了一场特殊的毕业旅行，准备开启一场紧张刺激的探险之旅，然而却阴差阳错闯入了一座巨兽栖息的禁忌之岛。因为人类的失误，这里成为怪兽的乐园，这群大学生的到来便如羊入虎口，一场血泪交织的人兽大战即将开场。而随着对孤岛的深入探索，他们发现这次“巧合”背后，似乎还隐藏着细思极恐的连环阴谋。

一群年轻的大学生策划了一场特殊的毕业旅行，准备开启一场紧张刺激的探险之旅，然而却阴差阳错闯入了一座巨兽栖息的禁忌之岛。因为人类的失误，这里成为怪兽的乐园，这群大学生的到来便如羊入虎口，一场血泪交织的人兽大战即将开场。而随着对孤岛的深入探索，他们发现这次“巧合”背后，似乎还隐藏着细思极恐的连环阴谋。

Kantaro, known as a rowdy boy in the town of Ina, attacked the local boss, Kaneoni's Arahira, all by himself, but was defeated by a large group of people and thrown into the Tenryu River, never to be seen again. Three years later, Kantaro, who was rumored to be dead, was reported to have appeared at a boarding house upstream of the Tenryu River by Genkō, a horseman who had been saved by Kantaro. O-Mitsu, the daughter of Chokai-ji Temple, who had secretly been in love with Kantaro, was thrilled by the rumor and told her father, the monk Ryokai, about it. However, Ryokai was none other than the one who had rescued Kantaro from the boarding house three years earlier and had secretly sent him to Edo.

北宋，皇亲葛彪驰马撞倒王老先生，王与之评理，葛彪令其弟将王打死。王母及三个儿子要葛彪偿命，葛彪蛮不讲理，被王氏三兄弟打死。葛三带领衙役将王氏三兄弟锁往县衙门。县令和葛父共同审理此案，他们不顾天理国法，将王氏三兄弟判成死罪。开封府尹包拯路过本县，王母状告葛家，包拯受理此案。但由于葛家势大，无人敢出来作证。包拯问王氏三兄弟是谁杀死了葛彪，三人争担罪名。包拯只得判王大为葛彪偿命，王母不肯；改判王二，王母也不肯；改判王三，王母应允。包拯怀疑王三不是王母所生，逼王母讲出实情，王母无奈，只好讲出王大、王二是王老先生前妻之子，王三是自己所生。包拯深受感动，决定再详查此案。深夜，包拯梦到三只小蝴蝶被风吹到蜘蛛网上，其中，两只挣脱，最小的一只被网缠住，大蝴蝶只得带领两只小蝴蝶飞去。包拯将最小的蝴蝶从蜘蛛网上救下，于是四只蝴蝶感恩拜谢后飞去。包拯醒来，惊奇自己的梦境恰似王母舍亲生。他经过周密的调查，终于弄清了案情，遂将王三释放，将葛三处以极刑。