My Top 20 All Time Favorite Sci-Fi Films.

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1.
Invasion of the Body Snatchers (1956)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A small-town doctor learns that the population of his community is being replaced by emotionless alien duplicates. (80 mins.)
Director: Don Siegel
 
2.
Planet of the Apes (1968)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
An astronaut crew crash-lands on a planet in the distant future where intelligent talking apes are the dominant species, and humans are the oppressed and enslaved. (112 mins.)
 
3.
Star Wars: Episode IV - A New Hope (1977)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
Luke Skywalker joins forces with a Jedi Knight, a cocky pilot, a wookiee and two droids to save the galaxy from the Empire's world-destroying battle-station, while also attempting to rescue Princess Leia from the evil Darth Vader. (121 mins.)
Director: George Lucas
 
4.
The Thing from Another World (1951)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
Scientists and American Air Force officials fend off a blood-thirsty alien organism while at a remote arctic outpost. (87 mins.)
Director: Christian Nyby
 
5.
The Thing (1982)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
It's the first week of winter in 1982. An American Research Base is greeted by an alien force, that can assimilate anything it touches. It's up to the members to stay alive, and be sure of who is human, and who has become one of the Things. (109 mins.)
Director: John Carpenter
“ Better than the original? No. But it isn't worse, and Carpenter created his own sci-fi/horror masterpiece. ” - SimplySteve
 
6.
Star Trek II: The Wrath of Khan (1982)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
With the assistance of the Enterprise crew, Admiral Kirk must stop an old nemesis, Khan Noonien Singh, from using the life-generating Genesis Device as the ultimate weapon. (113 mins.)
Director: Nicholas Meyer
 
7.
The Terminator (1984)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
A human-looking indestructible cyborg is sent from 2029 to 1984 to assassinate a waitress, whose unborn son will lead humanity in a war against the machines, while a soldier from that war is sent to protect her at all costs. (107 mins.)
Director: James Cameron
 
8.
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 planet 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
 
9.
The Day the Earth Stood Still (1951)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
An alien lands and tells the people of Earth that they must live peacefully or be destroyed as a danger to other planets. (92 mins.)
Director: Robert Wise
 
10.
Star Wars: Episode V - The Empire Strikes Back (1980)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
After the rebels have been brutally overpowered by the Empire on their newly established base, Luke Skywalker takes advanced Jedi training with Master Yoda, while his friends are pursued by Darth Vader as part of his plan to capture Luke. (124 mins.)
Director: Irvin Kershner
 
11.
Aliens (1986)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
The planet from Alien has been colonized, but contact is lost. This time, the rescue team has impressive firepower, but will it be enough? (137 mins.)
Director: James Cameron
 
12.
Time After Time (1979)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
H.G. Wells pursues Jack the Ripper to the 20th Century when the serial murderer uses the future writer's time machine to escape his time period. (112 mins.)
Director: Nicholas Meyer
 
13.
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.)
 
14.
The War of the Worlds (1953)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
A small town in California is attacked by Martians. (85 mins.)
Director: Byron Haskin
 
15.
E.T. the Extra-Terrestrial (1982)
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
A troubled child summons the courage to help a friendly alien escape Earth and return to his home-world. (115 mins.)
 
16.
Invasion of the Body Snatchers (1978)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
In San Francisco, a group of people discover the human race is being replaced one by one, with clones devoid of emotion. (115 mins.)
Director: Philip Kaufman
 
17.
Fantastic Voyage (1966)
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
A scientist is nearly assassinated. In order to save him, a submarine is shrunken to microscopic size and injected into his blood stream with a small crew. Problems arise almost as soon as they enter the bloodstream. (100 mins.)
 
18.
Westworld (1973)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
A robot malfunction creates havoc and terror for unsuspecting vacationers at a futuristic, adult-themed amusement park. (88 mins.)
 
19.
RoboCop (1987)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
In a dystopic and crime-ridden Detroit, a terminally wounded cop returns to the force as a powerful cyborg haunted by submerged memories. (102 mins.)
Director: Paul Verhoeven
 
20.
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.)