These films have been voted as the top Sci-fi films by users of IMDB. Can you guess the titles from the clues?
From 2008, the story of a small waste collection robot left on an abandoned earth.
Released in 1979 it stars Sigourney Weaver as Ripley.
Not your normal sci-fi film it tells the story of two stage magicians competing to perfect the ultimate illusion.
Stars Christopher Lloyd and Michael J Fox, oh and a DeLorean.
Back to the Future
From 1991, directed by James Cameron and starring Arnold Schwarzenegger who has turned from assassin to protecter.
Terminator 2: Judgment Day
With the human race facing extinction explorers must travel beyond our solar system in search of a habitable planet. Stars Matthew McConaughey and was released in 2014.
Luke Skywalker sets out to rescue Princess Leia from Darth Vader, with the help of Obi-Wan Kenobi and Han Solo
Star Wars: Episode IV - A New Hope
Released in 1999 and stars Keanu Reeves as a computer hacker.
Luke Skywalker receives Jedi training from Yoda, whilst Han, Leia, C-3PO and Chewbacca are pursued across the galaxy by Empire forces.
Star Wars: Episode V - The Empire Strikes Back
From 2010 and starring Leonardo DiCaprio as a criminal skilled in obtaining secrets from the subconscious mind.