Supreme Being

"Supreme Being" was the title of the ruler of Iris Wildthyme's mysterious Superiors.

Said Superiors once "nabbed" Panda with the intention of forcing him to become their new Supreme Being; however, he was able to escape, tagging along on the ship of a different incarnation of Iris to the one he had been travelling with. (PROSE: From Wildthyme with Love)

Behind the scenes

 * If, as is the clear implication, Iris's Superiors are none other than the Time Lords, "Supreme Being" must be taken to be an equivalent title to Lord President, much like First Time Lord. This allows Panda's refusal of the position and flight to mirror the Doctor's repeated flights from an offered Presidency, in such TV stories as The Deadly Assassin and The Five Doctors. However, an alternative interpretation is that the Superiors are the Clockworks, in which case Supreme Being might stand as the correct form of address for the leader of the Clockworks.