Ballustra

Ballustra was a planet in E-Space. It had lush terrain and large bodies of water. It had a population of 8 billion. Letrus was its moon.

History
A CVE appeared near Ballustra, it was the size of Letrus and growing. It quickly grew to a greater size than that of Ballustra.

The CVE let out pressure waves that caused earthquakes and tsunamis. 15% of the population was said to have died on the first day.

A joint military and scientific group set out to investigate the CVE. They took the Doctor's TARDIS capture. Romana and Adric were taken prisoner and delivered to Letrus. There they were questioned by Marni Tellis. (CC: The Invasion of E-Space)