Gregory, Ladybug, Cat Noir, and Glamrock Freddy go down under the Roxy Raceway and found an elevator. They decided to go see where it lead.

"Kids, be careful. This elevator does not appear to follow any safety protocols. I do not think it can survive more than one trip." Glamrock Freddy said.

They went into the elevator and went down further into the Pizzaplex. The elevator opens and shows an underground cave.

They explore and see generators and turns them on. As they explore, what they see appears to be some old abandoned pizzeria. They then go down a hole, deeper into the place, not knowing what lies below.

"I know what this place is. I have been here before. She brought me here. I found my self for the first time when I clear the path. I did not want to, but I had no choice. Now, I have a choice. I have chains. My friends are here. They are so angry... confused... But I can protect you. I AM NOT ME." Glamrock Freddy said.

They then saw a giant monstrous blob with mashup parts of other animatronics sleeping. They fell down into what looks like some bunker with a lab.

Far away in another room, was a dark force growing.
In a recharge station, something comes out of it. A tall, scary, purple, flesh, metal bunny animatronic comes out of it. It was William Afton.

He saw Glamrock Freddy on the screen and places his hand on it, trying to control him. Glamrock Freddy starts to shake in glitching.

"Stop him..." Glamrock Freddy said twitching as he struggled to remain in control.

"What is that? Are you ok?" Gregory asked.

"He is trying to take control of me. I do not think I can fight it for long." Glamrock Freddy said shrugging.

"He? What is that thing?" Gregory asked.

"It doesn't look friendly." Cat Noir said.

"Oh no... I think it's William Afton." Ladybug said. Cat Noir look in shocked to hear that name.

"William Afton? But I thought we were told that he died." Cat Noir said.

"Clearly he survived and became a monster." Ladybug said.

Gregory press a button that sets the room on fire, hurting Afton. He looks through one of the doors and sees Chica coming.

"Look out. It's Chica." Glamrock Freddy said.

Cat Noir shuts the door closed. Then Gregory keeps pressing the button while the others deal with the animatronics.

"It's Roxy. What do we do?" Ladybug asked as she saw her coming on the cameras.

"The doors will not hold her. Hide!" Glamrock Freddy said.

They all hide from Roxy coming in. Roxy then looks for them. Glamrock Freddy then created a vocal pitch to scare off Roxy.

"Watch out for the vents!" Glamrock Freddy said as Monty crawls through it. Cat Noir closes it.

"I think we're gonna need some luck here." Cat Noir said to his love.

"LUCKY CHARM!!!!" Ladybug cried out, summoning her powers and causing a... metal blade to appear in the air before dropping into her awaiting hands.

"Huh? A metal blade?" Ladybug muttered in confusion, not sure of why she received this type of  lucky charm.

Suddenly, long snake-like metal tentacles popped out each of the air vents waving around as they grab Gregory and Cat Noir. They were getting pulled to The Blob. She then realized what the Lucky Charm was for and starts cutting away at each tentacle. Gregory gets freed and hits the button one last time.

Suddenly, the place goes in flames. Afton tries to walk out, but The Blob, roared and grabs him, pulling him back into the hell he came from.

"Ladybug! We need to get out of here!" Cat Noir said.

"Hang on! Miracul—ACK!" Ladybug shouts as she was knocked off balance and dropped the Lucky Charm down a hole.

"No! The Lucky Charm!" Ladybug cried out to it.

"Forget about it, Milady! We need to get out of here before we're cooked!" Cat Noir said backing away from the growing fires. Gregory then hears Rodrick on his watch.

"Kids! Where are you?! You need to get out of here?! That area is coming down?!" Rodrick shouted.

The kids and Glamrock Freddy see this and started to run out as the place comes down. They soon reached the top and see Rodrick and Vanessa (who is no longer under Afton's control.)They then exit the building of the Pizzaplex. They look back to see the Pizzaplex surprised and relieved they finally made it out.