Triton
From Tardis Wiki, the free Doctor Who reference
Triton was a moon that orbited the planet Neptune. It was originally a rogue planet, until it was caught in Neptune's orbit.
Triton was a cold planet, with a thin Nitrogen atmosphere. It had frozen pink poles, volcanoes of ice and solid lakes. It was inhabited by the Waro. (PDA: The Devil Goblins from Neptune)