Limbo

Limbo, also known as the limbo dimensions, was a realm which physicaly looked like a White Void. The Trickster was generaly limited to limbo, only abe to manifest itself in the normal universe fleetingly. His Graske also had access to Limbo, and could materialize and dematerialize in and out at will.

The Trickster had sent Sarah Jane Smith to Limbo when she was removed from time. Maria Jackson was also sent here. (SJA: Whatever Happened to Sarah Jane?)

The Trickster put Sarah Jane and The Doctor and the rest of the gang in limbo both in differant times. (SJA: The Wedding of Sarah Jane Smith)