Heres the story {Five Nights at Sonic's: Secret of Crystals} (unofficial headcanon alert)

FNaS: SoC

At 1997 when Sonic's Fast Food (or idk what FNaS 5 Location is) closed 6 years ago Eggman has woke up from the coma and decided to ruin sonic fama by constructing animatronics on the worst way possible.

Eggman has decided to work with 97 Golden Sonic who where abandoned in the other location, they worked on a robot named Feelaksie (Jackie but FNaS)(Placeholder:

)

As they finished it they inserted into the programation a malware which teachs ai's about killing ppl (Inspired in M3GAN) and Feelaksie dosen't ever learned it so he where left to die in the Eggman's Basement.

Crystal Funtime Sonic BIG REAVEAL is the purple sonic

Learned about it and he wanted to infect all the other animatronics so (Spoiler chracter) wanted to crystalize all the other animatronics
What does Crystalize means?= Cystalize means make the other one who is being Crystalized gains motivation to kill anyone who is near {Humans only}

He could've not created even just a crystal that could Crystalize Doctor Jet (doing a art Later)

and then Mighty wanted to steal the Crystas to convince everyone to give him money or else they would be Crystalized

But the Crystalized Charcters would kill even animals (actually everything) exepct for animatronics and inanimated objects)

He Can melt anything tho

and the he decided the melt Feelaksie with crystals and the Crystal figures ( Mimic's ) entered onto Feelaksie body and the he is now trying to kill you and any thing that have some purple melting...

After all Mighty try to get away with the pendrive with a crystals exposed but Crystal Funtime Sonic is too fast that when Mighty where running he where walking and he could melt Mighty and Burn His Body...

Story of Infinity Rock

A plushie owned by a kid that liked infinite too much and cuz he had 2 different eye colors he liked it EVEN MORE!

After it Eggman (YEAH) gave the father of the kid a animatronic that was infinty rock and he could do A N Y T H I N G lol

after it the kid had gone into the mysterious ways (Infinity Rock animatronic killed him with his hands cuz in his body were a crystal hided so...

After it the kid soul grabbed the plushie and possesed the animatronic at night...