Helena Petrovna Blavatsky's theory of root races really picks up steam with the Lemurians, a spiritual race of giants. Then the continent of Atlantis rises from the ashes of Lemurian civilization followed by our current Aryan race which will eventually be replaced by a sixth race born from racial intermixing in North America. We discuss the rise and fall of these mythical races and analyze the internal logic of The Secret Doctrine.