Before the breakthrough of postcolonial studies, British science-fiction authors already saw the opportunity to discuss political and ethical issues of imperialism by projecting human history and behavior onto the alien 'Other.' In this thesis, the case studies of 15 novels of alien-encounter science fiction illuminate the treatment of colonial and postcolonial concepts - such as colonialism, neo-colonialism, Empire, paternalism, hybridity, mimicry and science and technology - as a means of conquest and resistance. The analysis also shows that the Empire is still a vital background for British science fiction. Thesis. (Series: Anglistik / Amerikanistik; English / American Studies - Vol. 35)