Director John Carpenter's then-girlfriend cowrote the screenplay with him. John Carpenter and Debra Hill cowrote "Halloween." Compass International PicturesAs the director, John Carpenter often gets all the credit for "Halloween," but he didn't do it alone. Debra Hill, a producer on the film and Carpenter's then-girlfriend, actually cowrote the film with him. She also helped write some of the sequel films, including "Halloween II" (1981).

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