十五年前的万圣节，哈登菲尔德镇的六岁男孩迈克尔（威尔•桑丁 Will•Sandin 饰）用一把菜刀杀死了他的姐姐，当人们发现他时，他正双手血淋淋的呆望着天空，无论怎样问话，他保持着那个姿势一动也不动。于是，迈克尔被送进了精神病院。在那里，医生费尽了心思，用尽了各种方法，迈克尔还是呆望天空一动也不动。直到1978年的12月30日，迈克尔（东尼•莫兰 Tony•Moran 饰）似乎听到了某种召唤，偷了精神病院的钥匙，独自偷走回到了家乡哈登菲尔德。一场新的杀戮即将开始……The year is 1963, the night: Halloween. Police are called to 43 Lampkin Ln. only to discover that 15 year old Judith Myers has been stabbed to death, by her 6 year-old brother, Michael. After being institutionalized for 15 years, Myers breaks out on the night before Halloween. No one knows, nor wants to find out, what will happen on October 31st 1978 besides Myers' psychiatrist, Dr. Loomis. He knows Michael is coming back to Haddonfield, but by the time the town realizes it, it'll be too late for many people.