The Reaper's Island Cave, related to Reaper's Island Village, is one of the two themes created by Spirit Halloween for the 2020 Halloween season. It resembles a stone-like structure with many columns, skulls, crates, and a large skull at the top.
- Ellie Hatchet (Stand-in)
- Harvester of Souls
- Krampus (Stand-in)
- Little Daisy and the Maestro (Stand-in)
- Miserable Marie
- Mommy's Favorite
- Sewer Varmint
- This theme was originally thought to be called Jack's Cave, named after Jack the Reaper, the mascot for Spirit Halloween, but was later confirmed to be called the Reaper's Island Cave by the theme's creator.
- A photo of this theme, taken at the flagship location and included in the directions for the ISE setup, was leaked by an anonymous store employee.
- This theme was originally intended to be a walkthrough, but cancelled due to COVID-19 restrictions. This is the first back theme since the Area 31 in 2017 to not include a walkthrough.
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