Fans like to hate on the Star Wars prequels, but arguably a bigger disaster is the fate that has befallen the original trilogy over the last two decades.

Clearly a fan of the idea that art is never finished, just abandoned, George Lucas has tinkered repeatedly with the movies that made his name. What follows is certainly not a definitive list of everything that has changed in the saga, but it's 20 of the biggest alterations, and we start right at the beginning...