Halloween H2O: 20 Years Later (1998)

After the success of the original Halloween, there were five so-so sequels before the seventh film breathed fresh life into the horror, thanks to Jamie Lee Curtis's return. Michael Myers' sister is now headmistress of a private school and the divorced, alcoholic mother of a teenager. But 20 years on from the original slayings, somebody or something has decided to mark the anniversary...