This document discusses codes and conventions of media forms and genres, specifically focusing on science fiction. It explains that genres develop through repetition and borrowing from other texts, and meanings are created through intertextuality. The learning aims are to examine themes of science fiction films from the 20th century to today, analyze the themes in Humans, and how micro-level elements create meaning for audiences within theoretical frameworks. It also provides an overview of science fiction from different decades and defines science fiction as genres existing in contexts and developing through borrowing, as suggested by Steve Neale.