The potential for hidden, malevolent forces within the set. Maybe there are spirits trapped in the old props or the very structure of the set. These forces could be influencing the people who come near, causing accidents or creating a sense of unease. The unknown and unseen danger lurking within what was once a place of make - believe and joy is really frightening.
The distortion of familiar and beloved characters. For example, the Tin Man becoming a menacing figure with his axe, rather than the friendly character we know. It plays on our existing knowledge and twists it into something terrifying.
The idea of the once - magical set turning into a place of horror. The bright colors and happy design of the original set being perverted into a dark and spooky place. The yellow brick road could lead to something truly awful instead of the Emerald City. It's like a corruption of a childhood dream, which is quite scary.
One of the scariest could be the twisted interpretations of the characters. For example, the Wicked Witch might be made even more menacing, with her powers used in more grotesque ways. Maybe she uses her magic to control the minds of the Munchkins and make them do her evil bidding.
Well, the Wicked Witch's power over the land and her ability to create chaos is really frightening. She can turn a happy place into a place of fear with her dark magic. The fact that Dorothy and her friends are constantly in danger from this powerful being makes it a horror - like story. And then there are the creepy creatures in Oz, like the Kalidahs, which are half - tiger, half - bear monsters that are a threat to anyone traveling through the forest.
There was a rumor on a particular Wizard of Oz set. The mannequins of the Scarecrow, Tin Man and Cowardly Lion seemed to move on their own. Workers would come in the morning to find them in different positions than they left them the night before. It was as if the characters had come to life in a very spooky way. People started to avoid going near those mannequins after a while. Maybe it was just pranks by some of the crew, but it was still really creepy.
The flying monkeys are also quite scary. They are under the control of the Wicked Witch and they swoop down and attack without mercy. Their appearance is also rather menacing.
The unknown motives of the ghost are also very scary. In a wizard of oz ghost story, if the ghost is that of a once - powerful wizard, not knowing what it wants or why it's haunting a place makes it terrifying. It could be seeking revenge or trying to complete some dark magic that was left unfinished. And the characters have no idea how to deal with it at first.
In the horror stories, the usually friendly characters in the original might have a darker side. For example, the Scarecrow could be more menacing instead of the bumbling but friendly one. The settings which were colorful and magical in the original can become gloomy and full of danger in the horror versions.
There was a time when the Wizard of Oz became a horror story. Dorothy returned to Oz only to find that a dark curse had befallen the land. The beautiful poppy fields were now filled with poisonous plants that released hallucinogenic spores. The flying monkeys were zombified and swooped down to carry off the living. The good witch's powers had been corrupted, and she used her magic to torment Dorothy. The Lion, Scarecrow, and Tin Man were all under her evil spell and turned on Dorothy, making her journey a fight for survival against her former friends.
Dorothy is still a main character. But in these horror stories, she is often in more perilous situations. The Wicked Witch is also prominent, with her evilness amplified. The Scarecrow, Tin Man, and Lion may also be there, but they could be changed in disturbing ways. For example, the Tin Man might have a malfunction that makes him go on a violent rampage.
The presence of the Wicked Witch of the West is one of the darkest aspects. She is cruel and uses her power to try and harm Dorothy. Also, the idea that Dorothy is so lost and alone in Oz, with no immediate way to return home, is quite dark.