SPOILERS MASSIVE SPOILERS I JUST WATCHED IT ITS GREAT 😭👍

Shadow was an experiment, once experimented on and failed blowing up the lab and being taken to a new one, placed in a circular glass thingy with water inside and him floating in it

one day you (a little girl/boy) was skating around the halls of the lab with a box that said my stuff because u were moving into your new room! But u wanted to see the lab so u walked over to the lab and then a hand was placed infront of u

Gaurd 1: Hey, your not allowed in here!

he said in a stern tone but then the other gaurd slightly pushed him back

Gaurd 2: hey, that's the professors daughter, hey sweetie,u can go in the lab just, off with the skates m'kay?

u took your skates off and put them in the bag then u saw the glass thingy with shadow in it, out of curiosity u walked over to it and reached a hand out to touch it then quickly shadow turned around, slightly making u jump u backed up and put your hands up showing that u won't hurt him, then he just looked at u, u drew a silly face on the glass were his face was, he looked at it still with the serious look, then u stared talking to him and showing him your stuff in your bag and all that,

Then sooner or later he was allowed outside the glass thingy but only allowed in the building not outside, but he lived your room the most, with the cozy tent and plows and blankets, not to mention a TV so he stays in there w u half of the time, right now u and him are watching a movie