Embodiment of Gris
The Embodiment of Gris (or the Embodiment Gris) was a mysterious entity about which little is known.
The Master allied himself with the Embodiment of Gris, but was defeated by the Doctor. (MA: Cold Fusion)
The Doctor and Brigadier Lethbridge-Stewart discovered the secret of the Embodiment of Gris during an adventure in Hong Kong in 1988. (NA: The Dying Days)
Zephon overthrew the Embodiment of Gris as Master of the Fifth Galaxy in 3932. (BFA: Neverland) Sometime between then and 4000, the Embodiment of Gris tried to depose Zephon, but failed. (DW: The Daleks' Master Plan)
Behind the Scenes
In The Daleks' Master Plan, the entity is referred to as "the Embodiment Gris", but as "the Embodiment of Gris" in all subsequent stories.