Black Christmas is a Canadian-American horror film series that comprises three standalone slasher films, as well as a novelization. The original film has gained a large cult following and is credited as being one of the first slasher films, inspiring many others, including the critically acclaimed hit Halloween (1978). The series centers around a serial killer that stalks and murders a group of sorority sisters. The 1974 film follows the character of Jess Bradford as she and her sorority sisters begin receiving threatening phone calls from an unknown stalker. The 2006 film explores the background and motivation for the killer and his family. The 2019 film completely abandons the first two films' killer storyline, instead focusing on a new set of characters and killers.