The Pixar Theory states that all movies made by Pixar are set within a single universe, but in different time periods within said universe.
Using the hints given, try to place each movie in chronological order within the "Pixar Universe," not in the order of their release.
There is a period within the timeline which doesn't contain a film. This is the "undocumented period." The hint also says (undocumented period) so you know when to click it.
"that's the Pixar Theory" is the end of the quiz
The meteor that killed the dinosaurs misses the earth, altering the history of this universe. We also see that animals will create their own societies if left to their own devices. 25 million years ago
Taking place in medieval Scotland, this introduces us to the concept of magic and animals personified as humans. 14th Century
The creation of first sentient machines that attempt to rise up and eliminate their only real threat; Super-humans. 1950's-60's
Here we witness the first signs of life found in inanimate objects. We also find that sentient objects follow a code of rules and are powered by human love. 1998
We discover that total isolation from humans is lethal, but museum interaction is considered utopia. We also see resentment, from toys like Jessie, over being abandoned by humans. 1999
This film shows the animals growing animosity towards humans for keeping them as pets. Dory's ability to read English also points to jumps in evolution. 2003
In this film we see that rats also hate and fear humans, and we witness the humans reacting to the first signs of intelligence of animals. 2007
We see an intense resentment for humans among sentient objects, as shown by Lotso's organization efforts in the daycare.(first appearance of BNL) 2010
BNL begins buying up all property and expanding the cities. Muntz's experiments on animals lead to a tipping point between animal and man. 2013
We see that emotions run humans lives, with love and happiness being the strongest (ultimately the best for powering batteries) ~2015
(undocumented period) BNL takes over the earth, eventually draining all resources from it, sending humans away on the Axiom, a ship controlled by a sentient machine. 2015-2200
With humans gone, sentient vehicles rise and take the role of dominant species on Earth. ~2200
The vehicles try to create cleaner burning oils to avoid polluting the planet. ~2205
Earth is lost to pollution. Centuries later, plant life is rediscovered. After the humans revolt against the machines on the Axiom, they decide to return and rebuild society. ~2800
The insect world has thrived in the rebuilt world and their society is more advanced than any other Pixar animals'. ~2900
After another long, undocumented era, humans and animals appear to have evolved beyond recognition, into monsters. ~4500
With the planet now completely out of resources, they develop doorways that can send them into the past to harvest emotions for energy. ~4520
One human girl discovers the land of monsters and spends her life studying magic and time travel trying to return, accidentally trapping herself in medieval Scotland. Using her magic to turn people into 'Kitty,' the monster she remembers from her youth, but whom she has rationalised as just being a bear.