The Thasians are a species of sapient non-corporeal beings native to planet Thasus which claim to have evolved beyond the need for physical bodies. Their appearance is that of a greenish energy blur and they can take the form of a humanoid head in order to communicate with solid species. Thasians have powerful psychokinetic abilities and are able to control matter around them in many ways, including changing an object's appearance or even causing it to disappear. They are also able to grant other species with these same abilities. The Thasians' homeworld is considered uninhabitable for more conventional lifeforms.