The document discusses the science fiction genre and how two films, Aliens (1986) and Annihilation (2018), use common sci-fi conventions while also differentiating themselves. Both films feature technologically advanced elements and creatures not native to everyday settings, aligning with typical sci-fi tropes. However, Aliens features dark, threatening aliens while Annihilation presents brightly colored creatures, subverting expectations. Key scenes and characters are analyzed in terms of their adherence to and manipulation of genre conventions.