Originally posted by Cmdr. Maddox
As far as I know thats not right!!
They Appear at DS9 also
He is right - their only appearance is in "The Tholian Web."
They are mentioned, however, in both TNG and DS9. In TNG, Riker's father was the sole survivor of a Tholian attack on a Federation Starbase - Riker later wrote a thesis about fighting them. The DS9 comments included a reference to "Tholian Silk" (which corresponds to the advanced materials science of Fesarius' write-up) and to the Tholian ambassador visiting late in the series (which conjures some interesting ideas about specialised life support).
Startrek.com also notes that "Tholians are a hive-mind and known for their punctuality. One of the independent border races that could have been dragged into a Klingon civil war, due to their proximity."
The novel Vendetta has the Tholian homeworld attacked by the superweapon for which Kirk's Doomsday Machine was only a prototype.
Jon
"There are worlds out there where the sky is burning, where the sea is asleep and the rivers dream; people made of smoke and cities made of song.
Somewhere there's danger, somewhere there's injustice, and somewhere else the tea is getting cold. Come on, Ace, we've got work to do."
THE DOCTOR, "Survival" (Doctor Who)