Based on coolness and scientific likelihood, which sci fi game/movie/tv series aliens do you think are the best? Personally, my vote goes to Stargate, which has a decent balance of humanoid and non humanoid aliens (with the bias towards a humanoid look explainable by the evolutionary process on earth like worlds) (and also including I think silicon based life IIRC, and those weird energy based ones (little glowing balls) that can fly through solid matter), spread out fairly thinly over a large galaxy (which suggests the probable rarity of intelligent alien species). They are also all at fairly different levels of technological capability, with as decent an amount of varied alien psychology as could be expected from a TV show that needs to be accesable to an audience, and finish in 50 minutes (not easy if you have to spend 40 minutes just trying to comprehend an entirely different mode of thoight.)
The only real problems I have with it is the prevelance of English among the aliens and non earth humans (almost all of which were taken from places where English was not spoken, and before the language even existed in its modern form), and the fact that so many different species have chosen to visit Earth at some point or another.
Tat said, I don't know all the sci fi universes, so I'd definitely like other opinions.
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