"According to Urantias text, half a million years ago, six colored races existed on our planet: red, orange, yellow, green, blue, and indigo. Again, according to the text, there was a racial superiority order with the indigo race at the bottom, in which, as it notes, "the blue man subdues the indigo" [UB 51:4.6]. It oddly states that strains of giantism can appear in green and orange peoples. The upshot of all of this is that on every planet in every universe, fair-skinned, blue-eyed aliens named Adam and Eve come and up-step the natives, meaning that they eliminate the inferior stocks and purify the planet."
January 1, 1970
https://en.wikiquote.org/wiki/The_Urantia_Book