The history of colonialism and colonial discourse constitutes a profoundly influential historical framework for the science fiction genre, from early literary works to contemporary cinema. The majority of science fiction stories inherently possess a colonial narrative, whether comprehended by the audience or not. This study aims to highlight the trauma experienced by imperialists during the decolonization process and its affect on post-World War II films, a period marked by the emergence of postcolonial theory. Drawing from the assumption that colonial policies are reproduced and reinforced in 1970s sci-fi films, Alien (Ridley Scott, 1979) and its sequels will be ideologically analyzed in accordance with the perspectives of authors such as Said, Fanon, and Memmi. The analysis of representations in the films will specifically address the justification of galactic colonization, the rationalization of the massacre of the colonized, and the monsterization of the 'other.'