Professor Clay (クレイ博士 Kurei-hakase), (original version: Clay Fermin (クレイ・フェルミン, Kurei Ferumin)) was Spectra Phantom (Keith) and Mira's father. He was also the Vexos' lead scientist and the creator of the Mechanical Bakugan. After his Bakugan Termination System was destroyed by Drago, he created the Alternative Weapon System at King Zenoheld's behest to annihilate entire worlds.