Geonosians were a winged, insectoid species native to Geonosis that created nests in large, spire-like colonies on their homeworld.
Geonosians were a caste-based species, and each hive was led by a queen. The queen laid eggs for the hive, and provided orders to the public leaders of Geonosis. Queen Karina the Great was able to control sentient beings, including her own Geonosians, with brain worms. There are other castes below the queens: upper-caste Geonosians have wings, but lower-caste Geonosians do not.
During the Clone Wars, Geonosis became a member of the Confederacy of Independent Systems. The Separatists used the Geonosians to create the Separatist Droid Army. This eventually led to a large battle between the Galactic Republic and the Separatists on Geonosis. The Geonosians were the ones responsible for creating the plans for the Death Star. Following the Clone Wars, Geonosis was sterilized by the Galactic Empire, nearly exterminating the native Geonosian population.
- "The Honorable Ones" (Mentioned only)
- "Ghosts of Geonosis" (First appearance)