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 is an alternative version of Earth, created by the Trickster's interference with Sarah Jane Smith's past. (SJA: The Temptation of Sarah Jane Smith)

In this reality, London appears to have become a blasted wasteland, with most buildings reduced to rubble. The sky is heavily clouded, and there is a blue-grey tinge to the atmosphere. The only inhabitants live in shanty towns, where they are forced to mine resources by Krislok, the Graske servant of the Trickster. The Tricksters eventual aim is to build a ship, in order to conquer the rest of the universe.

Negation
This alternate timeline is negated when Krislok agrees to help Rani by opening a time fissure. Rani communicates with Sarah Jane through the time fissure and tells her where the Trickster is set to manifest in 1951, when he creates this timeline. The Trickster is eventually destroyed and the timeline is negated.