Alien Races in Sci-Fi MoviesAgain, what is sci-fi movie without Alien Races, they drive our intrest to watch the movie, sometimes we hate them and sometimes we adore them. Aliens in sci-fi movies In popular fiction and conspiracy theories, life forms, especially intelligent life forms, that are of extraterrestrial origin, i.e. not coming from the Earth are referred to as alien and collectively as aliens. Prime examples of how aliens are viewed are found in the movies Alien, E.T. the Extra-Terrestrial, Signs, Independence Day, and The War of the Worlds. 
Typical characteristicsIn popular culture, such as movies and comics, "aliens" are often depicted as somewhat humanoid in their appearance (See Greys, Little green men). There are several reasons for this humanoid depiction in popular culture. It makes it easier for an alien in a movie scene to simply be a disguised human actor. Aliens in movies, in order to catch our attention, must trigger instantaneous emotional reaction; this requires a design based on recognizable human facial features and expressions. It is easier to relate to an alien with features we recognize such as arms and legs, two eyes, a nose and a mouth, as well as behavior we recognize such as baring its teeth in anger or widening its eyes in shock or surprise.
However, if real alien races exist, few people expect to find humanoid characteristics, believing that this would be too great a coincidence given an entirely different evolutionary scale. Here is a list of Alien Races: Star Trek
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This usage is clearly anthropocentric: when humans in fictional accounts accomplish interstellar travel and land on a planet elsewhere in the universe, the local inhabitants of these other planets are usually still referred to as "alien," even though they are the native life form and the humans are the intruders. In general they are seen as unfriendly life forms. This may be seen as a reversion to the classic meaning of "alien" as referring to "other," in contrast to "us" in the context of the writer's frame of reference.
