Have you ever seen Pixar’s WALL-E? No? Then go watch that, come back, and let’s discuss something somewhat troubling about this film.
There are a lot of movies that you can point to and say that the protagonists (i.e. heroes of the film) actually do more harm than good. There are some movies with tragic endings that would have been just fine if the protagonist had done nothing at all.
And I think WALL-E accidentally does the same thing, and not for the reason you may be thinking.
Let’s recap the story. WALL-E is set 800 years in the future. In this universe, Earth becomes incredibly overpopulated by the year 2105, with 200 billion humans contributing to an environmental disaster for obvious reasons.
In response, a world-dominating organization called Buy n Large (BnL) pledges to clean up the mess, though it’s heavily implied it’s mostly their fault, and they send all humans to space on executive cruise ships called “starliners.” But after only five years, BnL decides to abandon the planet completely because the air has become toxic.
Side note: Soon, my book on The Pixar Theory will be coming out, and it’s packed with theories that concern this movie and BnL in general. What you’re about to read is something that didn’t make it into the final draft, so BONUS!
Anyway, humans remain in space unbothered for 700 years, which is when the movie’s plot begins with WALL-E. When a probe named EVE arrives to find hospitable life, WALL-E falls in adorable robot love with her, and when she returns to deliver the plant-life she found, WALL-E frantically follows her.
WALL-E ends up on Axiom, one of many starliners running in a lifestyle “loop.” The humans there have been raised from birth to support and trust BnL and it’s routines for their entire lives. The robots satisfy all of their needs, and life is pretty much perfect in their minds, even though they do nothing for themselves.
It’s a strange setup because you’d think the people on Axiom would grow bored and feel stifled, but in contrast, they seem completely intent, until WALL-E arrives and causes a chain of events that leads to their return to Earth.
This brings me to the main point: The people of Axiom are incredibly nice, well-functioning people.
Not once do you see a human on Axiom acting spoiled or rude. Instead, they’re incredibly polite, especially when they meet WALL-E for the first time. John and Mary are two great examples. They’re not used to robots having a personality, and when they meet WALL-E, they are very positive and nice to him. You’d think they’d treat him terribly, but instead they befriend him and get eerily excited when they see him again.
The humans we see have friends, romantic relationships, and excellent living accommodations. The screens they view everything through are translucent, so they have no shame in letting other people see what they’re working on.
Even life expectancy isn’t a problem. When we see the panel of past Axiom captains, you can see that all of them live well over 100 years.
When the current captain of the ship becomes enamored with Earth, he appears to have the joy of a child. He’s incredibly optimistic, and in many ways, one of the central heroes of the film when it comes down to it.
In some of the final scenes, we see the humans showing a lot of empathy for WALL-E and EVE, even though most have them have no idea what’s going on. They cheer for the captain when he’s fighting Auto, and John and Mary don’t hesitate to risk their lives for the babies falling down the platform.
What caused humans to be thisnice?
Well, BnL apparently did. The society created by this “loop” of never-ending pleasure created a culture of interestingly polite humans, contrary to the spoiled rich kid syndrome you’d expect to see.
So was what WALL-E did for them…for the best?
If he had never followed EVE, the humans would sill be on the Axiom, but when the movie closes, the humans have returned to Earth. It’s depressing, but history repeats itself. Though we see shots of life rebuilding itself peacefully, won’t humans just make the same mistakes again and damage Earth completely this time?
It’s tricky because the movie is clever about how it makes you hate BnL, despite it being the invention of the very humans we sympathize with. Pixar overtly makes the conditions of the Axiom both horrific and enticing at the same time, but few people walk away from it thinking the humans made a mistake.
From a storytelling perspective, it’s genius on Pixar’s part. They present the humans in a way that makes us want the best for them. If they had made the humans spoiled and insufferable, we wouldn’t care about them as much as we do by the end.
But the weird side-effect of this characterization is that Pixar is unintentionally saying that BnL’s methods created a better society than the one we already have. We know it’s better because Pixar is intentionally saying the society we have is what caused the problems emphasized in the film.
So, here’s the question: Were the humans better off living in a society that made them the best they could be personally and socially? Or is living on Earth too important to ignore? I’m not convinced either way, to be honest.
Sure, the effects of gravity make you a blob dependent on a chair, but then again, it’s an awesome chair.
In Axiom’s society, there’s no crime from what we see. Everyone has their needs met. There’s likely no poverty, racial injustice, or food shortages. It’s utopia, but we think it sucks because the people aren’t skinny. Isn’t that a little messed up when you think about it?
Still, the captain makes a good point when he says, “I don’t want to survive, I want to live!”
But does everyone on Axiom want that, or is it just the result of one man who wants to impulse buy something he read about on the Internet? It’s hard to say.
Of course, I’m not saying Axiom would be the best for me or you. We’re accustomed to bike rides, trampolines, and Taylor Swift concerts. But if you told me there was a way to solve all of Earth’s problems in exchange for a few extra pounds, I’d have a hard time saying no.
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Since the initial release of The Pixar Theory, there have been countless changes and updates to the Pixar Theory timeline. Since it can get a little complicated (and nutty), I put together a new and improved outline that follows the book and includes all of the recent and upcoming Pixar movies. Enjoy!
Every Pixar movie is connected. I explain how, and possibly why.
In 2012, I watched a video on Cracked.com that introduced the idea (at least to me) that all of the Pixar movies actually exist within the same universe. Since then, I’ve obsessed over this concept, working to complete what I call The Pixar Theory, a working narrative that ties all of the Pixar movies into one cohesive timeline with a main theme. Another, longer, title is “The Grand Unifying Theory of Pixar Movies.”
This theory covers every feature-length movie made by Pixar Animation Studios since 1995. They include:
Toy Story
A Bug’s Life
Toy Story 2
Monsters Inc.
Finding Nemo
The Incredibles
Cars
Ratatouille
Wall-E
Up
Toy Story 3
Cars 2
Brave
Monsters University
Inside Out (in Part 2)
The Good Dinosaur (in Part 3)
Finding Dory (in Part 4)
Cars 3, Coco, Incredibles 2, and Toy Story 4 will be included in the upcoming book
The point of this theory is to have fun and exercise your imagination while simultaneously finding interesting connections between these fantastic movies. The trick is not take any of it too seriously. If you would like to experience a shorter version of this theory, check out the visualized Pixar Theory Timeline.
In fact, I highly suggest you watch this video I made with Screen Junkies/Fandom below. It more thoroughly lays out this theory and its most complex ideas. It’s also a far more “current” version of the theory compared to the rest of this post. Plus, it has more movies included! Enjoy.
The original Pixar Theory:
As of this writing in 2013, Brave is the first and last movie in the timeline. Obviously, this movie about a Scottish kingdom during the Dark Ages is the earliest time period covered by the Pixar films, but it’s also the only Pixar movie that actually explains why animals in the Pixar universe behave like humans sometimes.
In Brave, Merida discovers that there is “magic” that can solve her problems but inadvertently turns her mother into a bear. We find out that this magic comes from an odd witch seemingly connected to the mysterious will-of-the-wisps. Not only do we see animals behaving like humans, but we also see brooms (inanimate objects) behaving like people in the witch’s shop.
We also learn that this witch inexplicably disappears every time she passes through doors, leading us to believe that she may not even exist. Don’t get ahead of me, but we’ll come back to Brave. Let’s just say that for now, the witch is someone we know from a different movie in the timeline.
[Some of you have pointed out that the animals in Brave gradually regress back into an animal state, disproving the idea that this is the source of animals acting like humans. My rebuttal is simple. They regress because the magic wears off. Over time, their evolving intelligence grows naturally.]
Centuries later, the animals from Brave that have been experimented on by the witch have interbred, creating a large-scale population of animals slowly gaining personification and intelligence on their own.
There are two progressions: the progression of the animals and the progression of artificial intelligence. The events of the following movies set up a power struggle between humans, animals, and machines.
The stage for all-out war in regards to animals is set by Ratatouille, Finding Nemo, and Up, in that order. Notice I left out A Bug’s Life, but I’ll explain why later.
In Ratatouille, we see animals experimenting with their growing personification in small, controlled experiments.
Remy wants to cook, which is something only humans explicitly do. He crafts a relationship with a small group of humans and finds success. Meanwhile, the villain of Ratatouille, Chef Skinner, disappears. What happened to him? What did he do with his newfound knowledge that animals were capable of transcending their instincts and performing duties better than humans?
It’s possible that Charles Muntz, the antagonist of Up, learned of this startling rumor, giving him the idea to begin inventing devices that would harness the thoughts of animals, namely his dogs, through translator collars. Those collars indicated to Muntz that animals are smarter and more like humans than we think. He needed this technology to find the exotic bird he’s obsessed over, and he even comments on how many dogs he’s lost since he arrived in South America.
But then Dug and the rest of his experiments are set free after Muntz’s demise, and we don’t know the full implications of that, but what we do know is that animosity between the animals and humans is growing steadily. Now that humans have discovered the potential of animals, they are beginning to cross the line. To develop this new technology, the humans begin an industrial revolution hinted at in Up.
[Some have pointed out that Muntz was working in South America before the events of Ratatouille. This is true, but it is not explicitly stated how and when he developed the collars. Also, we know Ratatouille takes place before Up for several reasons. In Toy Story 3, a postcard on Andy’s wall has Carl and Ellie’s name and address on it (including their last names to confirm). This confirms that in 2010, the time of Toy Story 3, Ellie is still alive or hasn’t been dead long. This supports the idea that Up takes place years later.]
In the beginning of Up, Carl is forced to give up his house to a corporation because they are expanding the city.
Wait a second. What corporation is guilty for polluting the earth and wiping out life in the distant future because of technological overreach?
Buy-n-Large (BNL), a corporation that runs just about everything by the time we get to Wall-E. In the“History of BNL” commercial from the movie, we’re told that BNL has even taken over the world governments. Did you catch that this one corporation achieved global dominance? Interestingly, this is the same organization alluded to in Toy Story 3:
In Finding Nemo, we have an entire population of sea creatures uniting to save a fish that was captured by humans. BNL shows up again in this universe via another news article that talks about a beautiful underwater world.
Lines are being crossed. Humans are beginning to antagonize the increasingly networked and intelligent animals.
Think about Dory from Finding Nemo for a second. She stands apart from most of the other fish. Why? She isn’t as intelligent. Her short-term memory loss is likely a result of her not being as advanced as the other sea creatures, which is a reasonable explanation for how rapidly these creatures are evolving.
It’s likely that the sequel to Finding Nemo, which is about Dory, will touch on this and further explain why. We may also get some more evidence pointing to animosity between humans and animals.
[Some great users have pointed out that Dory is actually more intelligent and shows signs of growth due to her ability to read and communicate with whales. This would actually show signs of how the animals are beginning to change in intelligence gradually.]
And that is the furthest movie in the “animal” side of things. When it comes to A.I., we start with The Incredibles. Who is the main villain of this movie? You probably thought of Buddy, a.ka. Syndrome, who basically commits genocide on super-powered humans.
Or does he? Buddy didn’t have any powers. He used technology to enact revenge on Mr. Incredible for not taking him seriously. Seems a little odd that the man went so far as to commit genocide.
[A lot of people have been arguing about where The Incredibles actually takes place because we see technology from modern times and the 1980s even though everything has a 1960s vibe. This is cleared by Brad Bird, the director, who says the movie takes place in an alternate 1960s, which means the movie opens in the 1950s.]
And how does he kill all of the supers? He creates the omnidroid, an A.I. “killbot” that learns the moves of every super-human and adapts. When Mr. Incredible is first told about this machine, Mirage mentions that it is an advanced artificial intelligence that has gone rogue.
Mr. Incredible points out that it got smart enough to wonder why it had to take orders. The omnidroid eventually turns on Syndrome, and starts attacking humans in the city. Why would an A.I. want to just attack randomly? Do machines have an inherent hatred of humans?
The movie even shows clips of the superheroes with capes being done in by inanimate objects, such as plane turbines…accidentally.
But why would machines want to get rid of humans in the first place? We know that animals don’t like humans because they are polluting the Earth and experimenting on them, but why would the machines have an issue?
Enter Toy Story. Here we see humans using and discarding “objects” that are clearly sentient. Yes, the toys love it Uncle Tom style, but over the course of the Toy Story sequels, we see toys becoming fed up. But wait, toys and inanimate objects aren’t necessarily machines, so how do they have some kind of intelligence?
Syndrome points to the answer. He tells Mr. Incredible that his lasers are powered by Zero Point Energy. This is the electromagnetic energy that exists in a vacuum. It’s the unseen energy we find in wavelengths and a reasonable explanation for how toys and objects in the Pixar world draw power.
By the events of the Toy Story movies, we are in the 90s until 2010. It’s been 40-50 years or so since the events of The Incredibles, giving A.I. plenty of time to develop BNL.
Meanwhile, Pixar is hinting at dissatisfaction among pockets of toy civilizations. The toys rise up against Sid in the first movie. Jesse resents her owner, Emily, for abandoning her. Lotso Huggin’ Bear straight up hates humans by the third movie.
Toys are obviously not satisfied with the status quo, providing a reason for why machines and objects alike are ready to take over.
So, by the 2000s, the super-humans are all but gone, and mankind is vulnerable. Animals, who want to rise up Planet of the Apes style, have the ability to take over, but we don’t see this happen.
Also, A.I. never takes over humans by force. Why do you think that is? It’s reasonable to assume that machines did take over, just not as we expected. The machines used BNL, a faceless corporation (which are basically faceless in nature) to dominate the world, starting in the 1960s after the Omnidroid fails to defeat the Incredibles.
In each of the Toy Story movies, it’s made painfully clear that sentient objects rely on humans for everything. For fulfillment and even energy. It’s hinted at that the Toys lose all life when put away in “storage” unless they are in a museum that will get them seen by humans.
So machines decide to control humans by using a corporation that suits their every need, leading to an industrial revolution that eventually leads to…pollution. When the animals rise up against the humans to stop them from polluting the earth, who will save them? The machines.
We know that the machines will win the war, too, because after this war, there are almost no animals left on Earth. Who’s left?
Because the machines tip everything out of balance, Earth becomes an unfit planet for humans and animals, so the remaining humans are put on Axiom (or Noah’s Ark if you want to carry on the Biblical theme where Wall-E is basically Robot Jesus and his love interest is aptly named Eve) as a last-ditch effort to save the human race.
On Axiom, the humans have no purpose aside from having their needs met by the machines. The machines have made humans dependent on them for everything because that is how they were treated as “toys.” It’s all they know.
Meanwhile on Earth, machines are left behind to populate the world and run things, explaining human landmarks and traditions still being prominent in Cars. There are no animals or humans in this version of Earth because they’re all gone, but we do know that the planet still has many human influences left.
[Some have noted that the world of Cars can’t be after humans left because there’s no pollution shown in the movies. If you look carefully at Wall-E, however, the world is never shown during this time, so we don’t really know how badly the Earth was polluted.]
[It’s possible that the machines sent humans away to curb overpopulation and fix the environment without them, but the world was drained of resources as a result of machines populating the Earth. That would explain why the machines abandoned Earth entirely, leaving only Wall-E behind.]
In Cars 2, the cars go to Europe and Japan, making it plain that this is all taking place on Earth as we know it. So what happened to the cars? We’ve learned by now that humans are the source of energy for the machines. That’s why they never got rid of them.
In Wall-E, they point out that BNL intended to bring the humans back once the planet was clean again, but they failed. The machines on Earth eventually died out, though we don’t know how.
What we do know is that there is an energy crisis in Cars 2, with oil being the only way society trudges on despite its dangers. We even learn that the Allinol corporation was using “green energy” as a catalyst for a fuel war in order to turn cars away from alternative energy sources. That “clean” fuel could have been used to wipe out many of the cars, very quickly.
[Someone pointed out that “all in all” means the same thing as “by and large” making the connection between Cars and Wall-E even more substantial.]
Which brings us back to Wall-E. Have you ever wondered why Wall-E was the only machine left? We know that the movie begins 800 years after humans have left Earth on Axiom, governed by the AutoPilot (another A.I. reference).
Could it be that Wall-E’s fascination with human culture and friendship with a cockroach is what allowed him to keep finding fulfillment and the ability to maintain his personality? That’s why he was special and liberated the humans.
He remembered the times when humans and machines lived in peace, away from all of the pollution caused by both sides.
After Wall-E liberates the humans and they rebuild society back on Earth, what happens then? During the end credits of Wall-E, we see the shoe that contains the last of plant life. It grows into a mighty tree. A tree that strikingly resembles the central tree in A Bug’s Life.
That’s right. The reason no humans show up in A Bug’s Life is because there aren’t a lot left. We know because of the cockroach that some of the insects survived, meaning they would have rebounded a bit faster, though the movie had to be far enough in the timeline for birds to have returned as well, though they’re noticeably less intelligent than the bugs.
[I’ll admit, the trees looking similar isn’t enough to support the idea that A Bug’s Life takes place after Wall-E, but there’s definitely more reasons for why it’s likely. Also, I’ll bring the tree up again later because it appears in Up as well.]
There’s something strikingly different about A Bug’s Life when compared to other Pixar portrayals of animals, which leads me to believe it takes place in the future. Unlike Ratatouille, Up, and Finding Nemo, the bugs have many human activities similar to what the rats in Ratatouille were merely experimenting with.
The bugs have cities, bars, advertisements, their own machines, know what a bloody mary is and even have a traveling circus. This all assumes that the movie is in a different time period.
The other factor that sets A Bug’s Life apart from other Pixar movies is the fact that it is the only one, besides Cars and Cars 2, that doesn’t revolve (or even include) humans.
[Okay there is a a lot of contention over the idea that A Bug’s Life takes place post-apocalypse, but hear me out. The reason I am so inclined to push the idea is because of how different the bug world is from the “animal” movies. No other Pixar movie has animals wearing clothing, wild inventions, animals creating machines, or so much human influence like bars and cities.]
[In Finding Nemo, the most human thing we see is a school, and even that is pretty stripped down. But in A Bug’s Life, we have a world where humans are barely even implied. At one point, one of the ants tells Flik not to leave the island because there are “snakes, birds, and bigger bugs out there.” He doesn’t even bring up humans.
[Yes, there are some humans, like the kid who allegedly picked the wings off of the homeless bug, but that still fits in a post Wall-E world. Also, the bugs have to be irradiated for them to live such long lifespans. The average lifespan of an ant is just 3 months, but these ants all survive an entire summer and allude to being around for quite some time by saying things like “this happens every year.” One of the ants even says he “feels 90 again.” That works if you accept that the ants are sturdier due to evolution and mutated genes.]
There’s another Pixar movie that was supposed to be released in 2012, but it was cancelled and replaced with Brave. This movie was called Newt, and I believe it might have fit in this part of the timeline post-Wall-E. The movie’s supposed plot: “What happens when the last remaining male and female blue-footed newts on the planet are forced together by science to save the species, and they can’t stand each other?”
A movie about an endangered species rebuilding itself could lend itself nicely to this theory, but since the movie was never released, I’m just speculating.
So what happens next? Humanity, machines, and animals grow in harmony to the point where a new super species is born. Monsters. The monsters civilization is actually Earth in the incredibly distant future.
[Someone wisely pointed out that in Monsters University, the college is said to be founded in 1313. If we’re really in the future, then that means the monsters could have reset society and begun using their own calendar. That could mean Monsters Inc. takes place up to 1400 (or more) years after A Bug’s Life.]
Where did they come from? It’s possible that the monsters are simply the personified animals mutated after the diseased earth was irradiated for 800 years.
[Not during Wall-E. I would guess that it took hundreds of years after Wall-E for the animals to become monsters]
Whatever the reason, these monsters seem to all look like horribly mutated animals, only larger and civilized. They have cities and even colleges, as we see in Monsters University.
[An issue some have found is that this doesn’t properly explain what happened to humans. I haven’t settled on a theory I really like yet, but I’m leaning towards the idea that monsters and machines eventually forgot that they need humans and got rid of them again, not realizing their mistake until all humans died out. Another explanation is that humans just couldn’t survive on Earth anymore.]
In Monsters Inc., they have an energy crisis because they are in a future earth without humans. Humans are the source of energy, but thanks to the machines, again, the Monsters find a way to use doors to travel to the human world. Only, it’s not different dimensions.
The monsters are going back in time. They’re harvesting energy to keep from becoming extinct by going back to when humans were most prominent. The peak of civilization, if you will. Though a lot of time has passed, animosity towards humans never really went away for animals/monsters.
Monsters must have relied on anti-human instincts to believe that just touching a human would corrupt their world like it did in the past. So they scare humans to gather their energy until they realize that laughter (green energy) is more efficient because it is positive in nature.
[An alternative explanation that fits even better that some of you brought up: The machines and monsters created the time travel doors but realized that messing with time could erase their existence and change history. So, they falsely trained monsters to believe that humans are toxic and from another dimension, making it suicide for a monster to interact too much with their world.]
[Another issue is how the monsters seem to worry about kids “being less scared these days.” It’s likely that going in the past takes a lot of energy, so the monsters can only go back as far as the practice still returns a profit in energy. To them, they’re just moving through the same dimension of time, but the monsters at the top know that eventually, they’ll run out. This is why Waternose is so bent on capturing children and enslaving them.]
We even see a connection between A Bug’s Life and Monsters Inc. via the trailer we see in both movies. As you can see, the trailer looks exactly the same, except the one in A Bug’s Life is noticeably older and more decrepit, while the one in Monsters Inc. (where Randall is sent via a door) has humans and looks newer.
Look at the picture above. On the left is the trailer from A Bug’s Life and the one on the right is from Monsters Inc. The one on the left looks older and more rundown. Even the vegetation is noticeably dryer and there’s less of it. The trailer on the right has humans and the frame even includes tall grass and a tree hanging overhead.
[Some have argued that the trailer in A Bug’s Life should be nothing but dust. I disagree based on how barely intact other buildings were in Wall-E. They also bring up the bug zapper that is powered by electricity. The zapper could easily be solar powered, just like Wall-E. The bugs probably used it as a light source to signal other bugs to “Bug City.” Also, the trailer in A Bug’s Life never shows lights in the trailer like it does for Monsters Inc.]
That said, Monsters Inc. is so far the most futuristic Pixar movie. By the end, humans, animals, and machines have finally found a way to understand each other and live harmoniously.
And then there’s Boo. What do you think happened to her? She saw everything take place in future earth where “kitty” was able to talk. She became obsessed with finding out what happened to her friend Sully and why animals in her time weren’t quite as smart as the ones she’d seen in the future.
She remembers that “doors” are the key to how she found Sully in the first place and becomes…
A WITCH. Yes, Boo is the witch from Brave. She figures out how to travel in time to find Sully, and goes back to what she believes is the source: The will-of-the-wisps.
They are what started everything, and as a witch, she cultivates this magic in an attempt to find Sully by creating doors going backwards and forwards in time.
[Just to clarify: The theory is that Boo discovered a way to use doors to travel through time on her own, possibly by developing magic on her own. She probably went back in time to the Dark Ages to get more magic from the will-o-wisps.]
How do we know? In Brave, you can briefly see a drawing in the workshop. It’s Sully.
We even see the Pizza Planet truck carved as a wooden toy in her shop, which makes no sense unless she’s seen one before…(and I’m sure she has since that truck is in almost every Pixar movie). If you look closely, you can see the carved truck below.
You remember Merida opening doors and the witch constantly disappearing? It’s because those doors are made the same way from Monsters Inc. They transport across time and that is why Merida couldn’t find the witch later in the movie.
[A lot of people have brought up how easter eggs are scattered throughout all the Pixar movies. I barely scratch the surface, but a great theory offered by some that I support is that these easter eggs are planted by Boo either intentionally or accidentally as she travels through time to find Sully. Some support for that is the fact that every easter egg in Brave lies in her workshop.]
But wait. How did Boo travel in time in the first place, and why is she obsessed with wood? Boo must have discovered that wood has been the source of energy all along, not just humans. The machines and monsters in Monsters Inc. use doors because they’re made of wood and found a way to use that energy to travel in time.
[Many have pointed out how the door that banishes monsters is metal. That’s probably because wood is used to harness this magic, and using a metal door would stop a banished monster from going back through it.]
Obsessed with finding Sully, Boo travelled across the Pixar universe using doors.
[It’s even possible that the wood from the tree in A Bug’s Life is the source of Flik’s ingenuity, due to his fascination and respect for seeds growing into trees. The tree also bears a resemblance to the one in Up that Carl and Ellie frequented, which could be the source of Carl’s wild creativity in using balloons to transport his house.]
[This also explains why Flik and Heimlich from A Bug’s Life show up in Toy Story 2, which would be centuries before their time. Boo was trying to go to the future and could have fallen short by landing in the post-Wall-E time. She would need wood to keep time traveling, but there’s not much around yet, so she stumbles upon the tree in A Bug’s Life. She could have accidentally brought back a few bugs with her when traveling backwards in time.]
So Boo went back to the Dark Ages, probably because she could use plenty of wood there for her experiments or to study the will-o-wisps. We know that her first encounter with Mor’du ended with her turning him into a monstrous bear, but he regresses.
She probably wanted to turn him into a bear because Sully resembles a bear, and she is still trying to figure out where Sully comes from.
Does Boo ever find Sully? I like to think so. He surely reunited with her at least once as a child at the end of Monsters Inc., but eventually, he had to stop visiting.
But her love for Sully is, after all, the crux of the entire Pixar universe. The love of different people of different ages and even different species finding ways to live on Earth without destroying it because of a lust for energy.
And that is the Pixar Theory.
For Inside Out, The Good Dinosaur, and Finding Dory, the story continues in Parts 2,3, and 4 respectively, so here are some other helpful links for your reading pleasure:
Since the initial release of 
