Great Intelligence
The Great Intelligence’s exact nature was a mystery. It has often been compared to “a formless, shapeless thing, floating in space like a cloud of mist only with a mind and will” and as a mind parasite. It was thought to have lived in a universe before the Doctor’s and escaped it just before it ended. It was a disembodied sentience who attempted to find a body and physical existence by possessing people. When it wasn’t possessing people, it maintained a basic manifestation as a three-sided pyramid composed of control spheres
The Intelligence could also take on the form of “living snow” and manifest as ice people that they based on the human form
Appearances
The Abominable Snowmen (TV)
The Web of Fear (TV)
The Snowmen (TV)
The Bells of Saint John (TV)
The Name of the Doctor (TV)
Downtime (Direct to Video)
Millennial Rites (Prose)
Downtime (Prose)
The Forgotten Son (Prose)
Yonder…The Yeti (Comic)