Domed City
The Domed City is a citadel on Gorkel. Despite its name, it does not appear to have a dome.
Fiction
The Domed City belonged to Vermin the Vile. After kidnapping his niece, Princess (shudder) Ugly, he put her under a sleeping spell and secluded her in the Domed City, so that he could rule Gorkel in her place. The Book of the Gorkels foretold a time when alien creatures would arrive to break the spell; when Planet Terry and his friends wound up on Gorkel, they were put to the task by the Wise One. The Saga of Princess Ugly