Phylox series
From Tardis Wiki, the free Doctor Who reference
This topic might have a better name.
Phylox series, because it is only ever referred to that way.
Talk about it here.
The Phylox series was, according to the TARDIS data bank, a series of planets in either the Andromeda constellation or galaxy. Nyssa explained to the Fifth Doctor that Castrovalva was "in Andromeda. A small planet of the Phylox series." (TV: Castrovalva)
