Note: I did wait for Five Nights At Freddy's 4 to make this, but I probably shouldn't have because I am more confused on the events than ever. Spoiler alerts all around and please don't mind my interpretations of this.
The next morning, Mangle was deactivated and they were able to work on her. Opening her up, they saw she was a complete utter mess. Most of her body was rusted, bits and pieces out of place, even with her joints snapped back. They quickly removed all the pieces before polishing her entire endoskeleton, oiling her joints and reconnecting things properly. The only thing they decided to take off was the other endoskeleton head, which Hiro reviewed the AI of, which was that of a parrot. When they finished with her body, they moved onto the AI and voice box.
"This stuff is pretty advanced for the eighty's; facial recognition software, area sensors, realistic movement. Even her lines were diverse." Hiro spoke. "I'm going to upgrade her intelligence level, patching her ability to hurt humans and put a handicap on her jaw."
"Thank you!" Wasabi sighed.
"I picked a voice we can attach to the AI so we can understand her." Honey smiled, holding up the chip. "A nice soothing voice seems to fit her."
Hiro quickly uploaded it, along with everything else, to the AI in her head. "Well, here's to hoping." He switched her on.
With a loud electrical jolt, Mangle stood up quickly. She looked back and forth with her one eye at everyone and Baymax.
"Mangle?" Hiro began. "Listen, we fixed you up and even gave you a voice box, can you please tell us what happened?"
Mangle turned her neck down silently, as if almost ashamed. "It's hard to explain and I don't know everything. But, ever since my creation, the old animatronics and the Puppet has been haunted. He explained it to me."
Gogo tilted her head. "Who?"
"Puppet. He was the first... Who died. Killed by the 'Purple Guy'. He was angry, he wanted revenge. Especially when the others died. When the new franchise was created, and we were made, he was determined that it never happen again. So, he began to... Control us. The new animatronics that is. Then... The incident happened. I did bite someone on purpose, not like the 1983 bite where it was an accident. But... I swear." She looked up. "The Puppet made me. He thought he saw the killer and he wanted me to go. I missed."
Wasabi began to shake, the others remained a deathly quiet. They began to look at each other in confusion. Should they trust her?
"I believe her." Baymax stated suddenly. "AI like ours cannot lie."
Hiro looked at Baymax. "He's right."
"So what do we do with her?" Honey asked. "We can't just, you know, give her back if that thing's still there."
"I have an idea!" Fred chirped. "Let's rebuild Freddy's!"