The Tenth Doctor and Martha Jones once visited a planet which had once been home to an advanced humanoid species. However, at the time of their arrival the planet was presumably abandoned. While relaxing on a beach Martha heard a voice call her name in the jungle. She saw faces in the water, on the ground and on the tree bark and leaves, all staring at her. Martha ran back to the beach, and the Doctor pulled her by the hand. The Doctor explained that the environment collapsed, causing one hundred years of acid rain, dissolving the planet's people and their civilisation, somehow making them into a collective mind that was part of the planet for millions of years. Because they had run out of stories, the world intended to make the Doctor and Martha join them as they had new stories to tell. The Doctor rushed Martha back to TARDIS before the falling acid rain could hit them. (PROSE: The Planet That Wept)