Given birth by an unknown female and being the son of an unknown male, he was raised. Later on, he became a neutronist who worked with his colleague, Dr. Victor Falco. He was named Tyler Rockwell.
- Monkey Brains (Debut)
- Tyler has never been seen in the show, but his mutant form has been seen in the show various times.
- He was tricked by Dr. Victor Falco, who was formerly his colleague.
- The Mutagen that was used on him was improved by Falco.
- Victor once mutated Rockwell with his improved Mutagen with monkey DNA purposely into Monkey Rockwell so that with the DNA sample, Falco could turn himself psychic.