One of the oldest examples of transformation in horror is the myth of the Minotaur, a creature with the head of a bull and the body of a man. According to Greek mythology, the Minotaur was the result of a curse. The Minotaur was locked in a labyrinth and fed human flesh by King Minos, until it was killed by the hero Theseus. Another ancient example of transformation in horror is the legend of the werewolf, a human who can turn into a wolf or a wolf-like creature.
A more modern example of transformation in horror is found in many body horror stories, which involves the distortion, mutilation, or infection of the human body.