Sci-Fi is a genre that, until recently, was far more advanced than film-makers' capabilities.
The technologically advanced civilisations, the superpowers, and the post-apocalyptic are all things that have previously been difficult to do the visual justice they deserve.
So, right up until visual effects reached their current computer-powered capabilities, the easiest way for these things to be represented properly on screen convincingly was to draw them.
It might sound simplistic, especially when you consider the sheer timeless beauty of some of the entries on this list, but sci-fi is a genre that really highlights what an art form animation is.
Sci-Fi isn't always a genre that's particularly child-friendly, but once you add some colourful animation it's surprising just how easy it is to repackage a sci-fi movie into something that children will treasure and look back on with extreme nostalgia.
There are so many brilliant animated science fiction movies, many of them adaptations of existing movie franchises, and some adaptations of manga or comic books, and it's difficult to pick out just 10 that deserve the title "the best", but here they are.
WALL-E is everything you'd expect from a Pixar title.
It's cute, it's family friendly, and it has a few statements to make, which it manages to do as gentle a way as possible.
From the outset, WALL-E is impossible not to love. He's got giant, over-expressive eyes and, although he is a robot, he's reminiscent of a little lost puppy doing his best to complete the job given to him by his master.
Seeing him busy himself with the impossible task of cleaning up a world that has turned into a literal dump makes WALL-E as endearing as he is cute.
Then, there's the comic relief of the incredibly lazy humans who have allowed their technological advancements to cause wide-spread obesity, and, to top it all off, there's the most adorable robot love story.
WALL-E is the sort of film that leaves you feeling just a little richer for having watched it, and it's a brilliant example of how Sci-Fi can have a lighter side.