Todorov's theory proposes that stories follow a 5-stage structure: equilibrium, disruption, realization, restored order, and new equilibrium. This is exemplified in a Superman scene where the story starts with Niagara Falls in calm state (equilibrium), a boy falls in (disruption), people notice and panic (realization), Superman saves the boy (restored order), and returns to normal (new equilibrium). Levi-Strauss's theory is that narratives need binary opposites like good/bad to create conflict resolved at the end. Propp's theory is that stories typically include 8 character types like the villain, dispatcher, and hero.