The Trickster's World

The Trickster's Earth was an apocalyptic version of planet Earth in an alternate timeline. The timeline of the Trickster's Earth was accidentally created by Sarah Jane Smith when the Trickster lured her back to 1951.

Creation
This was an alternative version of Earth, created by the Trickster's interference with Sarah Jane Smith's past. In this reality, London appeared to have become a blasted wasteland, with most buildings reduced to rubble. The sky was heavily clouded, and there was a blue-grey tinge to the atmosphere. The only inhabitants lived in shanty towns, where they were forced to mine for resources by Krislok, the Graske servant of the Trickster. The Tricksters eventual aim was to build a ship, in order to conquer the rest of the universe. (TV: The Temptation of Sarah Jane Smith)

Negation
Sarah Jane, Luke and Rani travelled back through a time fissure to 1951 Foxgrove, where Sarah Jane's parents discovered who she was and restored the timeline. As a result, the Trickster's Earth timeline was negated, and the original timeline restored. (TV: The Temptation of Sarah Jane Smith)