In the beginning of Halloween, a six-year-old Michael (Will Sandin) murders his teenage sister Judith (Sandy Johnson) on Halloween, 1963. Fifteen years later, Michael (Nick Castle) escapes Smith's Grove Sanitarium and returns to his hometown of Haddonfield, Illinois. He stalks teenage babysitter Laurie Strode (Jamie Lee Curtis) on Halloween, while his psychiatrist Dr. Sam Loomis (Donald Pleasence) attempts to track him down.