WALL-E is, so far, the oldest story on the list since it shows that humans have now left the Earth for good after the cars have ruined it with their pollution. WALL-E is sent to clean up the wreckage left behind by years of decay following the animal/human/toy war that caused the humans to flee to space. This the end to the story of the theory because at the conclusion of WALL-E it is shown that the humans have now returned to Earth with their enemies defeated. It's a hopeful ending for the moment but we also have no way of knowing what Pixar has in store for future films.