What defines a thriller?

Fast paced action, constant motion.

These are just a few things which make up a thriller film a good example of a thriller film would be the sci-fi adaptation of "do androids dream of electric sheep?" (BLADE RUNNER) In which humanoid robots have gone rogue and it is the job of one Harrison Ford to track down the Cyborg and kill him. The film starts with alot of explosive scenery however little in the way of noise. this rather unexpected serenity is striking as it creates the feeling that there may something more sincere below the surface. Thrillers are all about making the audience feel uncomfortable and portraying fears which are very real amongst most people.   

  

There is a huge emphasis on the effectiveness of sound from the cyborgs echoing voice in the rain at the end to the vangelis sound track which sounds like it has been taken from mars itself. This film does use a great deal of special effects however still likes to keep the actions sequences as real as possible with few explosions and spaceships fighting each other it is a lot more about the interaction of the human beings and the robots.