Keith Fermin is the son of Professor Clay Fermin, and the eldest, and Mira is the youngest. He and his family went to New Vestroia during the Vexos rule. Alongside his father he studied the anatomy and the skills of Bakugan, which helped him in his training to battle, and he teached Mira about Bakugan.
But Keith wished to become the Vexos (ruler group) leader, ergo, become the leader of New Vestroia, and tries to use the power of Bakugan and high-tech for this. To keep his evilness in secret, he uses a mask, changes his name to Spectra Phantom and changes his hair color.