On Halloween 1997, ten-year-old Michael Myers stabs his sister Judith Myers to death and bludgeons her boyfriend Steve Haley to death. Other than his parents, the only person he spares is his baby sister Angel Myers.
Fifteen years later, Michael escapes from Smith's Grove Sanitarium during a prison transfer and makes his way back home to Haddonfield Illinois, leaving a bloody trail of corpses in his wake. Pursuing him is his former doctor, Sam Loomis, the only person who knows that Michael is nothing but true evil.
In Haddonfield, Michael steals a Halloween mask and a boiler suit, as well as the tombstone from his sister's grave. He then begins to stalk high school student Laurie Strode and her friends, Annie Brackett and Lynda Van Der Klok. Loomis also shows up and teams up with Annie's father, Sheriff Tom Brackett, to put an end to Michael's rampage. Unknown to everyone but Michael, Laurie Strode is actually Angel Myers.
While Laurie is babysitting little Tommy Doyle and Lindsay Wallace, Michael stalks her friends as well as her parents, Morgan and Cynthia Strode, before murdering them in a gruesome and brutal fashion.
Eventually, Laurie discovers the bodies of her friends in the house across the street and is attacked by Michael, who chases her back across the street. After an intense final chase, Laurie seemingly kills Michael and then sends Tommy and Lindsay to get help. They are spotted by Loomis, who arrives at the Doyle house just in time to save Laurie by shooting Michael. However Michael isn't defeated until Laurie stabs him and he falls into the swimming pool. But when Loomis goes outside to check the body, Michael has vanished, meaning he's still out there
