Vladimir Propp was a Russian formalist scholar who studied folk tales in the 1920s. He identified that many folk tales shared similar narrative structures and characters fulfilling narrative functions that drive the plot. Propp's theory outlines character archetypes like the hero, villain, donor, and princess. His work influenced filmmaking and showed that fairy tales follow a specific narrative structure. Propp's theory can be applied to analyze the plot and characters of horror films like Halloween and Texas Chainsaw Massacre in terms of the hero confronting the villain while receiving help from donors.