The Trickster's World

The Trickster's Earth was an alternate apocalyptic version of planet Earth. It was accidently 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. (SJA: The Temptation of Sarah Jane Smith)

Negation
This alternate timeline was negated when Krislok agreed to help Rani by opening a time fissure. Rani communicated with Sarah Jane through the time fissure and told her where the Trickster is set to manifest in 1951, when he created this timeline. The Trickster was eventually destroyed and the timeline is negated. (SJA: The Temptation of Sarah Jane Smith)