The Planet Cosmos are a series of planets featured in The Amazing World of Gumball. It is the in-show name for the solar system. Planets such as Saturn and Earth can be seen in several episodes, along with the Sun, and the Moon. In "The World," it was revealed that all of the planets are living beings.
- "The World": Earth sings. The rest sing at the beginning.
- "The Joy": They are seen on a poster.
- "The Extras": They are on a poster.
- "The Question": They sing "Your Life Doesn't Count."
- "The Singing": They make fun of Pluto.