The Tilonians are a formidable race of humanoids from the planet Tilon. They have enlarged, external sensory organs which allow them to interpret basic external stimuli as well as extrasensory input. They evolved breathing the unusual mixture of gases in Tilons atmosphere, and cannot survive on oxygen-rich planets. Thus, those Tilonians who traveled to other worlds must wear a sophisticated pair of goggles and an anti-oxygen mask whenever they are off-world. As a people, the Tilonians were known for their compassion and kind-heartedness, but also for the swift justice they meted out whenever necessary. It was believed that those individuals with silver irises to their eyes were very sensitive to the power of Seijans, but there has not been any definitive relationship identified.