Prologue
A long time ago, a pizza restaurant opened. It was run by two men called Henry Emily and William Afton. Shortly afterwards, kids started to go missing. It then turns out, they were killed by William. The bodies weren't found because there were stuffed inside animatronic suits. Years later, there were multiple restaurants with animatronics entertaining children.
Eventually, the restaurants were closed down one by one; some of them were burned down. In the future, Freddy Fazbear's Mega Pizzaplex was opened. Everyone came to see Glamrock Freddy, Glamrock Chica, Montgomery Gator and Roxanne Wolf. One night, a boy called Gregory snuck into the building and got trapped inside. He then met Freddy and they both decided to work together to escape the Pizzaplex.
The other three animatronics got a virus and had orders to find and kill Gregory. Whilst trying to escape, Gregory spots a lady in a white rabbit suit also trying to catch him. Gregory then had an idea: he would destroy the animatronics, take their parts and give them to Freddy. He took Chica's voice box, Monty's claws and Roxy's eyes; but the animatronics just turned back on.
Gregory upgraded Freddy, the time was 6am and the front door was open. As Gregory was about to leave, Freddy gave him a choice: stay or leave. Gregory then realised that if he left, more kids would go missing. He then decided to go after the white rabbit, also known as "Vanny." However, she knew they were coming for her, so she told the staff bots to destroy Freddy.
Gregory ran up to Vanny's hideout and saw an arcade machine called: "Princess Quest 3." He had already played the other two machines, so he decided to play it. At the end of the game, he opened a digital door and a scream was heard. Gregory stopped playing and looked outside. When he completed all three arcade machines, it killed the virus and the staff bots turned off.
On the ground, was the mask and suit of Vanny. Gregory got a backpack and put Freddy's head in it. He got to the front door and saw the security guard Vanessa waiting for him. She led Gregory outside and they walked away from the Pizzaplex. Afterwards, there was an earthquake and the Pizzaplex was closed and forgotten, because the earthquake had damaged the building too much.
After a while, a girl called Cassie gets a message from Gregory. He said that he was trapped inside the Pizzaplex and he needs her help. Cassie enters the abandoned building and searches for Gregory, whilst avoiding the remains of Freddy, Chica and Monty. However, Roxy was the only one that was friendly towards Cassie because they had met before.
Cassie then finds a secret elevator and takes it deep below the Pizzaplex. She then hears Gregory's voice behind a wall and drives a forklift through it. "Gregory? Gregory, you ok?" says Cassie. After stepping inside a dark room, she hears Gregory's voice say: "You saved me! You saved me!" Cassie looks over to where the voice came from and says: "Gregory?"
In the darkness, a figure stood up and said: "I'm Gregory." It then tossed a walkie talkie to Cassie and it's eyes glowed red. "You're not Gregory. What are you?" The figure slowly walked towards Cassie, it was a old endoskeleton that was mimicking Gregory's voice. It reached out to grab Cassie, but out of nowhere, Roxy leaped out in front of Cassie and said: "Cassie. Get out of here. Run!"
Cassie ran away from Roxy and the endoskeleton and jumped in a tunnel. As she was about to run away, Gregory's voice on her walkie talkie said: "Cassie! Cassie! Can you hear me?" "Gregory? Is that really you? I mean really you?" says Cassie. "I've been trying to reach you all night! I'm not at the Pizzaplex! Something is trying to trick you."
"You're a bit late! This thing in the basement sounds just like you. How do I know this is you for real?" "Is there another option? You need to get out of there now!" "How?" "My friend has access to the building maps. Just follow (static) instructions." Suddenly, the endoskeleton entered the tunnel and started to chase Cassie. As she ran away Gregory gave Cassie directions so she didn't hit a dead end.
Eventually, she ran into a hallway and at the end, was a elevator. Cassie put a device into a panel, unlocked the elevator and got in. She hit the button and the endoskeleton charged at Cassie. It reached out to get Cassie, but the elevator door closed and chopped off it's arm. As the elevator slowly raised up towards the surface, Gregory's voice came on the speaker inside the elevator.
"Cassie. It's me. I think I need to explain a few things. You were never supposed to go to the Pizzaplex. That thing in the sinkhole tricked you. I really don't know what it is, but it's been trapped down here a really long time. The M.X.E.S. security program was designed to keep it hidden, but you shut down the security. Now it's free. It's not your fault. I know you did it for me. To save me... but we can't risk being followed. I'm sorry." "Gregory? No!" says Cassie.
Suddenly, the elevator stops and falls back down into the basement.