John Carpenter's low-budget thriller spawned a series which numbers ten installments.
Counting Freddy vs. Jason, the Friday series stands at an even dozen movies.
Sequels, prequels and reboots have brought the Chainsaw family of movies up to six.
This saga of Jigsaw and his little games is up to six movies in as many years, with no end in sight.
Bad things come in small packages: Killer doll Chucky has starred in five movies.
Ignoring unauthorized knock-offs, the Romero zombie series is up to eight, including remakes of Night and Dawn.
Katie (Katie Featherston) is the only one to make it through all 4 Paranormal Activitiy movies,
The Nightmare count is eight to date (including Freddy vs. Jason). A remake is in the works.
Eight Hellraiser movies (to date) have made a star of the elegantly grotesque Pinhead.
The Exorcist franchise has a long history of showcasing demonic possesion with over 30 years between the first and fourth installments.