Kamen Rider Rider Amazons. A show reboot from the original Japanese TV series for kids rated R. Filled to the brim with guts, gore, and monsters eating people, especially in season 2. If that's not horror related, I don't know what is.
i have a few suggestions jaws was always scary Dolls 1987 i was scared of the trailer since middle school and Harry Potter. it may not be halloweenie but it's like die hard on christmas. perfect franchise for the season. hope you like them.
I feel as though a few Creepshow stories should be added, either from the original movie or some of the episodes from the Shudder series, since some of the stories are adaptations of literary works by other authors including Stephen King. But I'm not sure if that would even count.