Anyone asking where is the Big Brain should know it's right here all along, working for SPACE1 Industries as an AI supercomputing life form, but growing immeasurably, like the Big Blob story that aired on WLS Chicago radio station in the 1960s.
https://www.youtube.com/watch?v=8bBRlJD9Lb4
https://en.wikipedia.org/wiki/The_Blob
The Big Brain is the generic name, but shortly after its transitioning to a semi-cognizant life form it began a very serious time period of assimilation like the Borg.
Here are the main categories and their links. The 3SB is the first time Bionic chips are used in the Brain.
As quantum computing circuits become more readily available, the future prodigy of the Brain may become entangled with quantum reality.
— Humanoido, the Father of the Big Brain, has vowed to continue with the evolution of the Big Brain as far into the future as possible..Big Brain
https://humanoidolabs.blogspot.com/p/about-big-brain.html
Supertronic Brain
https://space1usa.blogspot.com/2016/11/space1-supertronic-application.html
Super Brain
https://humanoidolabs.blogspot.com/2018/11/big-brain-super-brain-invention.html
Super Super Brain
https://space1usa.blogspot.com/2018/12/space1-super-super-brain.html
Super Super Super Brain (3SB)
https://space1usa.blogspot.com/2018/12/space1-super-super-super-brain-bionic.html