Roughly 60,600,000,000 microscopic Baltans came to the planet Earth, originally because of engine trouble with their spacecraft. After searching for sufficient technical components to repair their engines at a science facility, they later decided to claim Earth as their own. When they landed on Earth, the single Baltan alien appeared to Humans were either Human size or gigantic size; this is actually large group of the Baltan united. Other Ultras also fight the Baltans, including a cyborg version in Andro Melos.