Zastros 8
From Tardis Wiki, the free Doctor Who reference
Zastros 8 was a peaceful world and free-thinking paradise, with attractions such as sunshine, seas, beaches with ultraviolet filtering, seaside resorts and computer sciences.
The Sixth Doctor tried to take Melanie Bush to Zastros 8, where a computer science conference was being held, but the TARDIS acted up due to the interference of the Nathemus and instead took them to Zastros 9, its counterpart. (AUDIO: The Brink of Death)