Five million years ago the Great Nebula Burst occured, an interstellar gas cloud formed by a supernova explosion devestated thermia and nearly destroyed it, creating what is now the Klatu Nebula. What is left of the planet has slowly been plundered for resources by the Sarris Dominion.
The Thermians built the Protector II with the intention of using it to search for a new homeworld. It seems though that after the defeat of Sarris the thermians focused their efforts on the creation of a new homeworld, aptly named, New Thermia.
- In both the novelization and the screenplay Thermia is referred to as Theramin.
- In the comic series Galaxy Quest: Global Warming its name seems to be misspelled as Thermi.