User blog comment:LukeLeia75/Five Nights at Freddy's Takeover/@comment-25910808-20141013222525

I'll be my own custom animatronic named ZX-23EP.

Basically, he originated from Future Protobot. After he was defeated, he left some parts behind. It was taken back to the present, in which it was built into a robot. He traveled into the real world, found Fazbear's Pizza and was brainwashed into attacking Mike.