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The main focus of this diploma thesis is picturing ethnicity and race of "non-humans" in first two series of science fiction series Star Trek: The Next Generation, Battlestar Galactica a Defiance. It is based on the postcolonialistic theory, which is dealing with the dominant relationship of the colonist over the colonized. This relationship was created between western civilization colonists and native inhabitants of newly discovered territories. In the case of science fiction, the "non- humans" are in the position of colonized and humans in the position of colonists. Some space is also given to the posthumanistic theory of a creature being based on combination of both biological and mechanical parts. The chosen series are examined through the method of quantitative content analysis. It has been shown, that humans in science fiction are the race, from which the picturing of all other "non-human" races is derived. Also, in most cases, humans are the race superior to other races, which is shown in various fashion. Values accepted by today's western society are presented as values of all human kind. From these values, the perception of "non-humans" and their societies is derived. Science fiction is also mirroring the problems western society had during its beginnings.