Traken

Traken was the homeworld of the Trakenites, a race of pacifists, and the capitol of the Traken Union. Its many plants required much care, a duty that was carried out by the Fosters.

The planet was in the system Metulla Orionsis and was watched over by the Keeper of Traken. It was said that there was so much good in the air that evil would just shrivel up and die.

The Doctor's companion, Nyssa, was a native of Traken. (TV: The Keeper of Traken)

The Second Doctor visited Traken with Jamie McCrimmon and Victoria Waterfield. (PROSE: The Astronomer's Apprentice)

The Fifth Doctor took Nyssa to Traken in the primeval age to cure her of an illness. (AUDIO: Primeval)

In 1981, whilst travelling to Earth from Logopolis in the TARDIS, Adric and Nyssa witnessed Traken and Metulla Orionsis being destroyed by a wave of entropy. (TV: Logopolis)