The grandfather of Blue and a reverse Master Roshi. He thinks he's the god of making machines, just wait until Yellow tells him the truth. His teacher and mentor, Dr. Master Bom, was the one who taught him and Dr. Shadow everything about mechanics and technological science. Dr. Gray Bomber is quite lively and way too active for an old man, and has an optimistic view on things. He dreams of getting the fame and attention his inventions deserve; No wonder Blue tries to avoid him