Enceladus

Enceladus (or Enkiladu) is a moon of Planet Sonorosia. The surface is blue, possibly made of Zoids. The Sonorosians who live there were upgraded into evolved form like species. The surface is also ragged and is usually misty. The atmosphere has a trace of Blue Zoid, ethane and methane thus making the planet toxic to humans. Ben's alien, Starscream is from this planet. Even, Cerebrocrustaceans haven't discovered how the Sonorosians evolve into their new form.