The document discusses several film theories that were researched to help structure the plot of a film trailer. It summarizes Todorov's narrative theory, which proposes films follow a five stage pattern: equilibrium, disruption, recognition, attempt to repair, new equilibrium. It also discusses Blumler and Katz's uses and gratifications theory, which explains why audiences seek out media to fulfill information, identity, social, and entertainment needs. Finally, it summarizes Propp's character archetypes and Dyer's star theory, which the document applies to consider characters and casting for the low-budget, British-style film trailer.