Mahasamatman

Mahasamatman was a human in the far future, the end result of an immortal soul that had been reincarnated multiple times. The soul was first born as James Lethbridge-Stewart in 1925, with its first reincarnation in 1951 as Owain Vine.

The soul attended enlightenment and ascended to become the mindless entity that would one day be called the Great Intelligence. (PROSE: The Forgotten Son, TV: The Abominable Snowmen, TV: The Web of Fear, TV: The Snowmen, TV: The Bells of St John, TV: The Name of the Doctor)