There are many who refer to a race as “Arcturian”; in fact there are different races that have come here from the star Arcturus. Edgar Cayce did describe one of these races accurately. In pre-Atlantean times, there were conflicts, and there were wars on the Earth. The Leonines (from Sirius) who were helped by yet another race from the constellation called Sirius, engaged in a brief war with the Reptilian races.
The starpeople from the Pleiades helped the humans learn many things; they drew (carved, or embedded using laser technology) star maps on rocks at Kariong and taught the evolving humans astronomy. They also taught them how to make fire, how to cook, and so forth. Yalarm tells there were many cities and civilisations started by different groups of starpeople on the Earth. The Atlantis that Plato wrote about is under the waters we now call the Mediterranean Sea. It was a larger evolution than many of the other places called Atlantis.
Yalarm tells of the history of Earth and how the Humans were genetically engineered. Before the Fall of Atlantis, there were many races of starpeople coming and going on Earth. Electricity was generated and distributed through grids under the Earth. The grids surrounding the Earth closed up somewhat to prevent the catastrophic energy from going out and affecting other planetary systems and galaxies. This is now loosened to admit the energy from the Source of All; it will raise all life forms on Earth and bring the Golden Age. 
Those that we call “starpeople” are actually light beings existing in other dimensions. They existed in the higher dimensions we had here on Earth. With the Fall of Atlantis, the Earth peoples fell out of the 4th and 5th Dimensions. The light beings and star peoples from different races in the Universe embedded higher vibrations and light in their children by Earth peoples. This gave rise to so-called junk DNA which has come back into its own, due the return of Earth to the 4th and 5th Dimensions. 
Yalarm (who has come to talk about matters on Earth in Atlantean times) indicates that he once had an (incarnation) on one of the stars in Sirius. Yalarm tells that there are many different races on the stars and planets in this constellation. Light beings can also change their colour. Light is colour, colour is vibration, and light beings may vary their light and vibration; there is a sound which goes with that as well. Time is different in the other dimensions, compared to time as measured by scientists on Earth.