The document discusses different theories of narrative structure. It explains that Tzvetan Todorov viewed most narratives as having an initial state of equilibrium that is disrupted by an outside force, which the protagonist then works to overcome. Vladimir Propp analyzed folktales and identified common character roles like the hero, villain, and helper. Claude Levi-Strauss examined how myths reflect a culture's beliefs through binary oppositions. The document notes these theories can be applied to analyze the narrative structures of genres like horror films.