The best sci-fi ever

Empire Strikes Back Director: George Lucas
Cast: Harrison Ford, Mark Hamill
Fleeing the evil Galactic Empire, the rebels abandon their new base on Hoth. Princess Leia, Han Solo and the droids R2-D2 and C-3P0 escape in the damaged Millenium Falcon, but are later captured by Lord Darth Vader on Bespin. Skywalker, meanwhile, follows Ben Kenobi's posthumous command and receives Jedi training by Yoda on Dagobah. Will Skywalker manage to rescue his friends from the dark lord?.
Donnie Darko Director: Richard Kelly
Cast: Jake Gyllenhaal, Patrick Swayze
Troubled adolescent, Donnie Darko, receives a disturbing vision that the world will end in 28 days. With the help of various characters, including a 6 foot rabbit called Frank, he slowly discovers the mysterious physical and metaphysical laws that govern his life and that will lead up to the destruction of the universe.
Alien Director: Ridley Scott
Cast: Sigourney Weaver, Ian Holm
The crew of the deep space mining ship Nostromo are awaken from hypersleep to investigate a strange signal from a nearby planet. While investigating the signal, they discover it was intended as a warning, and not an SOS. What follows are some grisly and inventive special effects based on the work of HR Giger.
2001: A Space Odyssey Director: Stanley Kubrick
Cast: Gary Lockwood, Keir Dullea
The monoliths have been watching us. They gave humankind the evolutionary kick in the pants it needed to survive at the Dawn of Time. In 1999, humankind discovered a second monolith on the moon. Now, in the year 2001, the S.S. Discovery and its crew, Captains Dave Bowman and Frank Poole, and their onboard computer, HAL 9000, must discover what alien force is watching Earth....
Brazil Director: Terry Gilliam
Cast: Jonathan Pryce, Robert De Niro
Bureaucracy and ductwork run amok in the story of a paperwork mixup that leads to the imprisonment of Mr. Buttle, shoe repairman, instead of Harry Tuttle, illegal freelance Heating Engineer. Bureaucrat Sam Lowry (prone to escapes to a fantasy world) gets branded a terrorist and becomes hunted by the state himself in the process of correcting the mistake.
Blade Runner Director: Ridley Scott
Cast: Harrison Ford, Sean Young
Los Angeles, 2019: Rick Deckard of the LAPD's Blade Runner unit prowls the steel and micro-chip jungle of the 21st century for assumed humanoids known as 'replicants'. Replicants were declared illegal after a bloody mutiny on an Off-World Colony, and are to be terminated upon detection. Man's obsession with creating a being equal to himself has back-fired.
Moon Director: Duncan Jones
Cast: Sam Rockwell, Kevin Spacey
Astronaut Sam Bell has a quintessentially personal encounter toward the end of his three-year stint on the Moon, where he, working alongside his computer, GERTY, sends back to Earth parcels of a resource that has helped diminish our planet's power problems.
Metropolis Director: Fritz Lang
Cast: Alfred Abel, Gustav Fröhlich
It is the future, and humans are divided into two groups: the thinkers, who make plans (but don't know how anything works), and the workers, who achieve goals (but don't have the vision). Completely separate, neither group is complete, but together they make a whole. One man from the "thinkers" dares visit the underground where the workers toil, and is astonished by what he sees...
Back to the Future Director: Robert Zemeckis
Cast: Michael J Fox, Christopher Lloyd
Marty McFly helps out his friend Doc Brown, and ends up being taken back in time by Doc's time-machine. Marty, a boy of the 80s, has to come to grips with being in the 50s and get his parents to fall in love to set straight the damage his presence has done to the events of the past.
The Matrix Director(s): And & Lana Wachowski
Cast: Keanu Reeves, Laurence Fishburne
In the near future, a computer hacker named Neo discovers that all life on Earth may be nothing more than an elaborate facade created by a malevolent cyber-intelligence, for the purpose of placating us while our life essence is "farmed" to fuel the Matrix's campaign of domination in the "real" world. He joins like-minded Rebel warriors Morpheus and Trinity in their struggle to overthrow the Matrix.