Alright, so I've been meaning to explain this for some time now. And I figured writing it down was faster than drawing it so here we go.
So basically my whole FNAF world starts in FNAF 1, with Mike beginning his job in the pizzeria. He works there for a week before he grows accustomed to his job and is becoming suspicious of the pizzeria's past, from the newspaper clippings. He tries to get closer to the animatronics when they help him prevent a robbery. Mike convinces them that he is not an endoskeleton and they start to become friends. A bit of tension rises between them when Mike shows them Phone Guy's recordings. To add on top of that, a new security guard is hired, Jeremy Fitzgerald Jr.
Jeremy comes to work quite shaken and carrying a Freddy mask, which he got from his father who worked at the old establishment and warned him. He never takes it off and is truly terrified. It takes Mike another week to convince the others that Jeremy is not an endoskeleton. Jeremy explains where he got the mask, after much questioning, which leads to the animatronics becoming very quiet and secluded. Mike thinks it's because they miss hanging out with the toy animatronics, so he asks Jeremy for a favor.
Jeremy asks his Dad the address of the old location. His father tells him and warns him that the animatronics bite, knocking on his head for emphasis, before laughing it off. Jeremy and Mike go to the old location where they sneak inside and find all the toys in their original places.
They get them onto a truck, Marionette wrapped around Jeremy's leg the entire time, and then haul ass to the pizzeria. In the spare parts room, the guys are getting ready to surprise the animatronics but the toys won't turn on. Panicking, Jeremy locks the spare parts room just as it turns 12. They lie to the animatronics, saying the boss told them to lock it. They then seek the help of a good hacker or technician who can activate the toys but won't call the cops. Jeremy suggests talking to his roommate who worked at the pizzeria too, Fritz Smith (who I'm in the process of designing).
Fritz comes to the pizzeria, eyes glued to his handheld as the guards lead him to the back room. His attention is immediately on the toys and he gets to work, Marionette wrapped around his torso. He leaves just before midnight, taking his payment of a large pepperoni pizza. Jeremy activates the toys and they think he is his father. They turn on Mike since its after hours and he goes running out of the room. Fredrick manages to catch him but is quickly stopped by the other animatronics when it turns twelve.
That's all to that part of the story cause the rest I'm still working out. If you have any questions to anything of my FNAF Universe, that doesn't involve FNAF 4, feel free to ask me.