The Top 10 Greatest Sci-fi Films

The films on this list will be evaluated based on how good of a sci-fi film they are, not favourite film which happen to be sci-fi films. As a result the order will be different from my top 50 films of all time.
*Possible Spoilers!!*
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1.
2001: A Space Odyssey (1968)
    1 2 3 4 5 6 7 8 9 10 8.3/10 X  
Humanity finds a mysterious, obviously artificial object buried beneath the Lunar surface and, with the intelligent computer H.A.L. 9000, sets off on a quest. (149 mins.)
Director: Stanley Kubrick
“ One of the greatest and most iconic films ever made, yet also one of the most personal films. 2001 took sci-fi films from visions of invasions to quite possibly the most accurate sci-fi ever made containing question on life and existence beyond human experience. The brilliance of 2001 lies in its cinematography, questions and the hidden answers, along with it's mysterious use of a monolith. Its a film which gives you everything for you to make sense of yourself. The films touches on theories such as Nietzsche's Ubermensch, the metaphysical and the even quest for 'God'. Even still, the films iconic ending causes you think. ” - tom314
 
2.
Blade Runner (1982)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
A blade runner must pursue and try to terminate four replicants who stole a ship in space and have returned to Earth to find their creator. (117 mins.)
Director: Ridley Scott
“ Blade Runner still is a dark, rain and neon soaked masterpiece. The films ending is still one of the greatest scenes ever filmed. Its constant sense of dread, conflict of man vs. machine - a concept perhaps growing more relevant with each passing day - and the unscripted "moments will be lost in time, like tears...in rain". ” - tom314
 
3.
The Matrix (1999)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
A computer hacker learns from mysterious rebels about the true nature of his reality and his role in the war against its controllers. (136 mins.)
“ The Matrix is still one of the most philosophical and heavily religious films ever made, and probably ever will. Using theories of Plato, Socrates, Descartes, Nietzsche and Baudrillard along with others as well as various religions. The Matrix still is one of the most complex films ever made. ” - tom314
 
4.
Inception (2010)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
A thief, who steals corporate secrets through use of dream-sharing technology, is given the inverse task of planting an idea into the mind of a CEO. (148 mins.)
“ In a time of dull and unexciting blockbusters, Inception comes along and shows everyone how its done. The idea of penetrating dreams is a bizarre one, yet once you're in them, it gets ever stranger. Nolan gets the balance of science, action, and substance perfect, whilst maintaining complete control of the story whilst delving deeper into a mind bending reality. ” - tom314
 
5.
Alien (1979)
    1 2 3 4 5 6 7 8 9 10 8.5/10 X  
After a space merchant vessel perceives an unknown transmission as distress call, their landing on the source moon finds one of the crew attacked by a mysterious lifeform. Continuing their journey back to Earth with the attacked crew having recovered and the critter deceased, they soon realize that its life cycle has merely begun. (117 mins.)
Director: Ridley Scott
“ Never has a sci-fi film managed to blend tension and horror and produce the same result. Alien still remains as one of the truly great horror films and defining science fiction films. A simple plot with very mundane characters produces something much, much more. ” - tom314
 
6.
Close Encounters of the Third Kind (1977)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
After an encounter with U.F.O.s, a line worker feels undeniably drawn to an isolated area in the wilderness where something spectacular is about to happen. (137 mins.)
“ Close Encounters is a fairly unique sci-fi film about alien encounters. Instead of arriving with hi-tech weaponry to destroy earth their visit is much different. Spielberg creates countless moments of uncertainty among the characters along with magnificent scenes of encounters, combining terror and wonder until reaching its truly magnificent final scene. Visually, Close Encounters is one the greatest along with being a incredible film. ” - tom314
 
7.
Looper (2012)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
In 2074, when the mob wants to get rid of someone, the target is sent into the past, where a hired gun awaits - someone like Joe - who one day learns the mob wants to 'close the loop' by sending back Joe's future self for assassination. (119 mins.)
Director: Rian Johnson
“ Looper's plot is simple; a target is sent from the future to the present day (set 2044) is then taken out by a looper who then disposes of the body in the past. When a looper fails to close his loop, he has to finish the job. The film tackles some major paradoxes along with time travel questions head on and makes near perfect sense off them, only tripping up on two parts. Still, they are not easily noticeable and affect the film in no way. ” - tom314
 
8.
Solaris (1972)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
A psychologist is sent to a station orbiting a distant planet in order to discover what has caused the crew to go insane. (167 mins.)
“ It's been hailed as the Russian 2001, Tarkovsky's film heads in the opposite direction to Kubrick's masterpiece. Where as Kubrick goes out to answer the grand questions, Tarkovsky's heads deep inside for the answers. Dealing with the philosophical questions on the human existence, Solaris does it with an unmatched brilliance. ” - tom314
 
9.
Prometheus (2012)
    1 2 3 4 5 6 7 8 9 10 7.0/10 X  
Following clues to the origin of mankind a team journey across the universe and find a structure on a distant moon containing a monolithic statue of a humanoid head and stone cylinders of alien blood but they soon find they are not alone. (124 mins.)
Director: Ridley Scott
“ The 'Missing Link' has raised many questions. Some have said that the bones of the earliest human ancestor are yet to be found, others say there was a large leap from Neanderthal man to Homo Sapiens, others believe the human race to be an experiment. Prometheus' plot is exactly that, where did man originate from, is there a missing link, and are we alone? Although many have criticised it for many reasons, Prometheus is a very philosophical film about the quest for 'God', mankind's origin, the conflict of belief. The battle between science and religion is used to provide more questions and allow for greater answers. Can science and religion work as one? Is there a 'God'? Is God dead? Are we 'God'? ” - tom314
 
10.
Back to the Future (1985)
    1 2 3 4 5 6 7 8 9 10 8.5/10 X  
Marty McFly, a 17-year-old high school student, is accidentally sent 30 years into the past in a time-traveling DeLorean invented by his close friend, the maverick scientist Doc Brown. (116 mins.)
Director: Robert Zemeckis
“ Each decade has a series of films which define it, Back to the Future is one of them. Not only is it extremely cool - along with Marty McFly being exeptionally awesome being that he pretty much invents rock n roll - it's one of the best films ever made. ” - tom314