Zarodnix was a member of the Cult of Morbius. He was descibed as the man with a Morbius obsession. He forced The Doctor to go into the past and bring Morbius back. He also drained power from the heart of The Doctor's TARDIS. (BFA: The Vengeance of Morbius)
He was a merchant, buying and selling planets. Among others he bought Karn from the Sisterhood of Karn. (BFA: Sisters of the Flame)
