As Freddy's Fazbear Pizza became increasingly popular, William Afton continued to plot his dark plan behind the scenes. Driven by his thirst for power and desire for revenge, he planned a macabre ritual to possess the animatronics with the souls of five innocent children: Jeremy, Susie, Fritz, Gabriel, and Cassidy.

William knew he needed a disguise to take the animatronics to the abandoned shed without raising suspicion. He approached Henry, his former business partner, with a seemingly convincing excuse.

"Henry, I've noticed that the old animatronics are getting a bit worn out. I think it would be best to take them to the basement, where we can make some improvements and repairs. This way, they can continue to enchant the children with their magic," William said with false concern.

Henry, still trusting William, agreed with the idea. He believed it was a way to preserve the memories and magic of the original animatronics. Unaware of William's true intentions, Henry took the animatronics to the abandoned shed on the night of the ritual.

In the darkness of the shed, William performed his dark ritual. He had prepared an altar and mysterious symbols to channel the energy of the children's souls into the animatronics.

The five children, trapped and terrified, were forced to participate in the ritual against their will. William showed no mercy or remorse. He was determined to complete his plan, no matter the cost.

As the ritual continued, a sinister energy enveloped the animatronics, and the souls of the children began to transfer into them. Each of the animatronics - Freddy, Bonnie, Chica, Foxy, and Fredbear - came to life, possessed by the souls of the children.

For a brief moment, the room was filled with an eerie glow. William's plan was coming to fruition, and he felt the power flowing into the possessed animatronics.

However, something unexpected happened. As the children's souls merged with the animatronics, they also brought forth their memories and personalities. Now, the animatronics possessed by Jeremy, Susie, Fritz, Gabriel, and Cassidy also carried a mix of the children's emotions and experiences.

The shock and pain these children had endured before losing their lives were now connected to the animatronics. They felt the sadness, fear, and agony of the children they now possessed.

Meanwhile, Michael and Charlie were suspicious of William's actions, especially after the disappearance of Spring Bonnie and his father's suspicious behavior. They decided to investigate on their own and followed the trails that led them to the abandoned shed.

When they arrived there, Michael and Charlie witnessed the dark ritual and the possession of the animatronics by the souls of the children. They were horrified by what they saw and realized that William had gone too far.

Michael felt a mixture of anger and sadness. He knew he had to confront his father about his terrible actions and stop him from causing more harm.

"Enough, Father! This has to end!" Michael shouted, confronting William.

However, William was ruthless and convinced that his plans were just. He mocked Michael and Charlie, making it clear that he didn't care about the consequences of his actions.

"You two are fools! You don't understand the power I'm about to gain. Nothing will stop me from achieving my goal!" William exclaimed, with a maniacal look.

The confrontation between father and son was intense, with Michael and Charlie fighting to prevent William from carrying out his evil plans. Meanwhile, the possessed animatronics watched in silence, feeling the emotions and memories of the children now a part of them.

With Charlie's help, Michael managed to temporarily deactivate the possessed animatronics, interrupting William's dark ritual.

"You won't win, Father. What you've done is terrible and cruel. Your actions have consequences, and it's time to pay for your sins," Michael said firmly.

"Hahaha, my plan is just beginning," said William.

"How did you find out about this, Father?"

"Well, it was 10 years ago, during your mother's death."

In the flashback, we'll go back 10 years to 1975, to a time when William Afton had just killed his wife, Wendy Smith, Evan, Elizabeth, and Michael's mother. He noticed that his wife's soul seemed to have a blue light coming from her, and after that, William decided to test this soul on inanimate objects. This was a crucial moment in his quest for immortality and control over his own experiments, the animatronics.

One day, after a series of unsuccessful experiments with the animatronics project, William was deeply frustrated. He felt he needed to find a way to make them more "alive," to make them interact with children and customers more authentically.

It was during his research into ancient legends and mythologies that he came across references to something called "remnants." According to these stories, remnants were the residual energies left behind by human souls after death. These energies were powerful and could become trapped in objects that held special meaning to the person in life.

Intrigued by this possibility, William delved deeper into the concepts of remnants and how they could be manipulated. He conducted numerous experiments, both with inanimate objects and the animatronics themselves, to find the right formula.

After many tests and attempts, William finally succeeded in extracting remnants from objects and transferring them into the animatronics. This discovery was a turning point in his quest for immortality, as he now had the power to give life to his own projects and control them in an unprecedented way.

However, as William continued his experiments, he began to realize that the presence of remnants also came with its dangers. The souls trapped in the objects resisted William's control at times, causing unpredictable behaviors in the animatronics. Furthermore, the remnants also carried traumas and negative feelings, making the animatronics even more unstable and dangerous.

Despite the risks, William was willing to face the consequences, as his ambition and desire for power blinded him to the dangers of his experiments. He was convinced that mastering remnants was the key to achieving immortality and becoming an all-powerful figure.

This sinister discovery changed the course of history, not only for William Afton but also for all the lives he crossed, including those of the innocent children who would be engulfed by his disturbing experiments.

Thus, William's pursuit of knowledge and power unleashed a series of dark and terrifying events that would have terrible consequences for everyone involved. The future held even more dark secrets, and the fates of all were interconnected in ways none of them could predict.

Although William escaped at this moment, Michael and Charlie were determined not to let him continue spreading darkness and chaos. They knew the battle against their father had only just begun.

As the sun rose on the horizon, Michael and Charlie looked at the possessed animatronics, now asleep. They knew these five innocent children deserved justice and peace. They promised they would never give up fighting for the truth and for a better future.

This dark night marked the beginning of a new phase in Michael, Charlie, and everyone else's lives involved in the story. The fight against darkness was far from over, but with courage and unity, they were determined to face the challenges that lay ahead.