The top 20 artificial intelligence films - in pictures

Since Fritz Lang gave us'false Maria' in 1927's landmark sci-fi film Metropolis, robots have terrified and fascinated moviegoers in equal measure. With the release of Alex Garland's Ex Machina, Michael Hogan picks his top 20 films (in no particular order); including Star Wars, The Terminator, Star Trek and Blade Runner; that star A.I. beings who have challenged what it means to be human.