Urbinia was a planet in the Third Galaxy. Baralda was one of its neighbouring planets. It had a pale-green sky with purple corkscrew clouds.
Its capital city, Kiria, was a seat of great learning throughout the whole galaxy, with a bustling intellectual community which dedicated itself to all schools of science, politics, philosophy and culture.
In an alternate timeline, created by a temporal collision with its future self, the First Doctor's TARDIS became stranded on Urbinia instead of landing on Kembel. As a result, the Daleks were able to develop the Time Destructor, and they attacked the planet three months after the Doctor's arrival, intent on enslaving the Urbinian population. Although most settlements on Urbinia fell to the Daleks, the Dalek Supreme ordered the Time Destructor be used to destroy the planet after the leadership in Kiria refused to surrender and continued with their efforts to evacuate.
This timeline was averted by the Second Doctor, sending his previous incarnation back on course to Kembel to stop the Daleks. His time spent on Urbinia was erased, but the Doctor still remembered the name of the planet. (AUDIO: Daughter of the Gods)