- You may be looking for the cyborgs named after this creature.
There were a number of fairy tales on Gallifrey about "the Toclafane", with which the Doctor and the Master were familiar in their respective childhoods. The Tenth Doctor described "Toclafane" as "a made-up name like the Bogeyman", treating the thought of their material existence as outrageous. (TV: The Sound of Drums [+]Loading...["The Sound of Drums (TV story)"])
In a later account, the Eleventh Doctor wrote of "the Toclafane" as "the bogeyman" of Gallifrey", and claimed the term did not refer to a specific entity or entities but was used to address any supernatural creatures in Gallifreyan folklore. (PROSE: How to be a Time Lord [+]Loading...["How to be a Time Lord (novel)"])
Having reemerged after the Last Great Time War and allied himself with desperate, cyberneticaly modified survivors of humanity at the end of the universe, the Saxon Master took them back in time and, posing as Prime Minister Harold Saxon, presented them to humanity as "the Toclafane", an alien race who had "contacted" him. Due to his tongue-in-cheek use of the name, the Doctor, watching the TV broadcast, immediately realised there was more to the metal spheres than the Master claimed, and refused to refer to them as such. (TV: The Sound of Drums [+]Loading...["The Sound of Drums (TV story)"], Last of the Time Lords [+]Loading...["Last of the Time Lords (TV story)"])