|First appearance||"Neutopia" (6ACV20)|
The rock aliens are the inhabitants of Neutopia. They are basically made up from rocks, but have an advanced civilization that uses money, clothing, magic-like force powers and space travel through asteroids.
Rock aliens do not have a difference of gender - they all only have one gender, called "neuchacho".
The rock aliens can apparently live for an extremely long time, even millions of years, as evident by the big rock alien saying "I have nothing to do for the next eight million years".