Planet of 7 Colors

In the universe, where all living beings are robots, a Rainbow Planet is home to 7 countries that correspond to each colour of the rainbow. The planet has colourful dome around it protecting it from outside danger. Meanwhile, The Dark Planet controlled by the Black Hole King searches around finding, then feasting on other planets for energy. One day, the Dark Planet stumbles upon the Rainbow Planet, and tries to eat it, but cannot due to its dome, however the 7 countries on the Rainbow Planet ar...