Top Ten seminal science-fiction films...

...in no particular order - a personal list.

• Forbidden Planet - Shakespeare's The Tempest given a science-fictional re-interpretation
  
• Metropolis - imagination ahead of its time
  
• 2001: A Space Odyssey - the first SF religious movie, with special effects that even today have not been surpassed (equalled, but not surpassed)
  
• Blade Runner - Ridley Scott's dystopian free-adaptation of Dick
  
• The Matrix - awesome spectacle, shame about the sequels
  
• Brazil - Gilliam's finest (in fact, anybody's)
  
• Silent Running - greenhouses in space, with cute robots
  
• Star Wars - Episode IV: A New Hope - strictly fantasy rather than SF, despite the space-ships, robots and futuristic weapons
  
• ET - The Extra-Terrestrial - highly successful, but full of Spielberg schmaltz
  
• Close Encounters of the Third Kind - another influential Spielberg flick, though my least favourite here

Remember: not in order. Also remember: this is my list.