Stacy Hamilton (Jennifer Jason Leigh) is a pretty, but inexperienced, teen interested in dating. Given advice by her uninhibited friend, Linda Barrett (Phoebe Cates), Stacy gets trapped in a love triangle with nice guy Mark Ratner (Brian Backer) and his more assured buddy Mike Damone (Robert Romanus). Meanwhile, Stacy’s classmate Jeff Spicoli (Sean Penn), who lives for surfing and being stoned, faces off against Mr. Hand (Ray Walston), a strict teacher who has no time for the slacker’s antics.
On a cold Halloween night in 1963, six year old Michael Myers brutally murdered his 17-year-old sister, Judith. He was sentenced and locked away for 15 years. But on October 30, 1978, while being transferred for a court date, a 21-year-old Michael Myers steals a car and escapes Smith’s Grove. He returns to his quiet hometown of Haddonfield, Illinois, where he looks for his next victims.
Five high school students from different walks of life endure a Saturday detention under a power-hungry principal (Paul Gleason). The disparate group includes rebel John (Judd Nelson), princess Claire (Molly Ringwald), outcast Allison (Ally Sheedy), brainy Brian (Anthony Michael Hall) and Andrew (Emilio Estevez), the jock. Each has a chance to tell his or her story, making the others see them a little differently — and when the day ends, they question whether school will ever be the same.