The Sinkars were a species of helium-based slugs native to the planet Sinkar. They survived on solar energy and impurities extracted from the planet's surface. Galactic rumors conflicted as to the exact nature of the Sinkars—some claimed that the slugs were telepaths of great strength who communicated wisdom accumulated over a long lifetime. Others claimed they were mindless creatures, capable of sucking energy from other beings or starship drives.