《万圣节H2O》是该系列恐怖片第一集《万圣节——恐怖之夜》故事的延伸。故事讲的是劳瑞·斯特罗德的双亲早亡,她成了她弟弟迈克尔·梅耶斯唯一的保护人,梅耶斯从小性格古怪并沉浸在杀人的乐趣中,当时还是十岁的梅耶斯就杀死了他的另一个姐姐米迪斯。万圣节前夕,梅耶斯偶然见到了劳瑞与其男友亲热的场面,他竟丧失理智拿起一把锋利的屠刀冲进屋内,将劳瑞的男友剁成肉酱,梅耶斯被送进疯人院。十五年后,精神病专家、医生洛米斯去找梅耶斯,想治好他的病,可是梅耶斯已逃之夭夭。又是一个万圣节前夕,一 Halloween H2O is an extension of the first episode of the series “Halloween - Horror Nights”. The story is about Laurie Strodt's parents premature death, she became her brother Michael Myers the only protector, Imex childhood eccentric and immersed in the fun of killing, was still ten years old Myers killed his other sister Midis. On the eve of Halloween, Meyers happened to meet with Laurie and his boyfriend. He unexpectedly picked up a sharp butcher knife and stormed Laura's boyfriend into a meat sauce. Myers was sent to the asylum. Fifteen years later, the psychiatrist and physician Lowames went to find Meyers and tried to cure his illness, but Meyers had fled. Another Halloween, one