Tremas Master

	DW: The Keeper of Traken (cameo; introduction) DW: Logopolis DW: Castrovalva DW: The King's Demons Birth of a Renegade DW: The Five Doctors DW: Planet of Fire DW: The Mark of the Rani DW: The Trial of a Time Lord: The Ultimate Foe DW: Survival
	[[actor::Anthony Ainley|Anthony Ainley]]

Dying, the Master merged with the body of Council Tremas of the Traken Union creating a new incarnation of himself. This incarnation caused the regeneration of the fourth incarnation of the Doctor.