Maximillian Stael was a scientist who, along with Adam Colby and Thea Ransome, worked for Dr. Fendelman in studying "Eustace". He was secretly the leader of a coven which worshipped the Fendahl, and he led the ceremony which transformed Ransome into the Fendahl Core. When he saw his coven members being transformed into Fendahleen, he realized it had all gone horribly wrong. His fate was sealed when he briefly locked eyes with the Fendhal, and was overcome by a permanent, near-total paralysis. Realizing he was doomed, he used a gun which the Doctor gave him at his request to commit suicide, saving himself from the fate of his bretheren. (DW: Image of the Fendahl)
- Although several sources spell his first name with one l, it is spelled Maximillian in the credits.