Denossus

Denossus was a high traffic space port used by a variety of aliens. As a test for greater plans to assimilate the universe, the Vortexians removed Denossus from reality and took it into the Time Vortex. After twenty years, the Second Doctor, Zoe Heriot, and Jamie McCrimmon arrived and returned Denossus to the universe. (COMIC: Land of the Blind)