This alternate timeline focuses on the battle between Laurie Strode and Michael Myers. Who returns after being dormant for twenty years in Halloween H20.
Michael Myers escaped from the Illinois State Mental Hospital after 15 years of treatment for the brutal murder of his sister and has returned to Haddonfield to relieve his crime. What follows is a reign of terror. He came home for Halloween and may return.
On October 31, 1978, Michael Myers (Halloween) is shot and falls off a balcony. Taking shelter to recover from his injuries, Michael steals a kitchen knife from the home of an elderly couple, and kills a teenage girl living next door. Laurie Strode, who narrowly avoided being killed by Michael earlier in the night, is taken to Haddonfield Memorial Hospital, while Michael's psychiatrist, Samuel Loomis, continues his pursuit of his patient. Accompanied by Sheriff Leigh Brackett, Loomis mistakes teenager Ben Tramer for Michael, when Ben gets hit by a squad car which pins him to another vehicle that bursts into flames, leading to his death. Upon learning his daughter Annie Brackett was killed by Michael, Sheriff Brackett goes off duty to inform his wife, leaving Deputy Gary Hunt in charge to help Loomis.
On October 29, 1998, in Langdon, Illinois, Dr. Loomis' former colleague, Marion Chambers (Nancy Stephens) discovers that her house has been burglarized. Her teenage neighbor Jimmy (Joseph Gordon-Levitt) and his friend Tony (Branden Williams) search the house and call the police. Marion discovers that the file on Laurie Strode (Jamie Lee Curtis), Michael Myers' sister, is missing. She rushes over to warn Jimmy and Tony only to find them both dead. Michael Myers (Halloween) (Chris Durand), who had been presumed dead for the past twenty years, appears and attacks Marion before slitting her throat, killing her. The police arrive as Michael leaves the house with Laurie's file.
On , Laurie Strode accidentally kills a paramedic with whom her brother Michael Myers (Halloween) had swapped clothes. A guilt-ridden Laurie becomes an inmate at the Grace Andersen Sanitarium, where the nurses believe her to be catatonic. Instead, she is preparing for Michael's return. Three years later, on October 31, 2001, Laurie, pretending to be heavily medicated, prepares herself for the inevitable confrontation with her brother. Michael breaches the facility and kills two security guards, as he makes his way to Laurie. After a chase, Laurie lures Michael on to the institution's rooftop. Although he falls into her trap, Laurie's fears of again killing the wrong person get the better of her; when she tries to remove his mask, Michael kills Laurie by stabbing her and throwing her off the roof. Michael returns home to his abandoned childhood house.