Planet (The Krotons)

An Earth-like planet was home to the Gonds, whom the more advanced Krotons, not native to this world, enslaved. It had low gravity (though not to a noticeable degree) and orbited a binary star system. Its atmosphere contained high levels of both ozone and sulphur and the surface tellurium and magnesium silicate. The Second Doctor and his companions later arrived on this planet and defeated the Krotons. (TV: The Krotons)