This is one that has been touched on before but I’m posting about it anyways because so many people seem to sleep on it. The English version of this flick is called Fantastic Planet, and it’s stunning. The soundtrack is brilliant, and has been sampled for so many hip hop tracks that it’s almost guaranteed to sound familiar. In my opinion the style of the animation is perfect for the story, and while there are plenty of “wtf” type scenes in there they never get boring. There’s a description of the story here, and the whole film is available on YouTube.