This work constitutes an approach to the literature-cinematography relationship, which establishes a sort of "love-hate" link between both artistic branches throughout their history. The approach of this study, based on the universality of the story (a category to which both the novel and the cinema belong), allows us to analyze the analogies, convergences and divergences between the literary and the filmic narrator in the work of a prolific writer - Bioy Casares - whose written work has usually been a target of film adaptations, as is the case with "El sueño de los héroes", the work chosen for this study.