Before we start, let's meet 3 characters that will be very important. A pair of twins by the names of Jeremy and Simon Fitzgerald, and a girl that for now, will only be known as Mary.

Part 1: Fredbear's Family Diner

We begin with the opening of Fredbear's Family Diner. It has four characters. Fredbear, SpringBonnie, The Puppet, and Jessica Jr. AKA, JJ. The restaurant was a huge success, and became widely known around the town it open in. Fredbear would perform with The Puppet, and SpringBonnie would perform with JJ.

At some point, Jermey breaks into Fredbear's Family Diner for an unknown reason. He eventually causes SpringBonnie to knock over JJ, causing his nightmares of JJ. JJ would be scrapped, but the diner would still grow in popularity.

Eventually, someone desided to try and compete with Fredbear's by opening The Rat and Cat Theatre. While popular, it never reach the amount of popularity.

About nine months would pass. In between that amount of time, Simon kills a kid outside of Fredbear's Family Diner as a beginning to his experiments. That child would go on to possess The Puppet. The murder causes the restaurant to be closed down. After those nine months pass, something would happen at The Rat and Cat Theatre, but that's for later.

I hope y'all like my theory so far. I'm going back to doing research for it. See y'all later.