The Pixar Theory

Finishing up the timeline...

A/N: This part has A LOT to do with magic, so please forgive me if this offends you in any way. It's just all part of the theory and it wouldn't make sense if I took out some of the words and stuff.

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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.