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"Watch as my child enters your Jedi friend."
―Karina the Great taunts her captives — (audio) Listen (file info)[src]

Brain worms were a species of parasitic worm from the planet Geonosis which were capable of entering the body of a host and taking control of it[1] and had the potential to control entire societies.[2] During the Clone Wars between the Galactic Republic and the Confederacy of Independent Systems, the Geonosian Queen Karina the Great used brain worms to control a host of undead Geonosians.[1]

After Republic forces defeated Karina and her minions, a brain worm managed to infect the clone trooper "Scythe" and used him to infect a number of other clones in Tango Company as well as the Jedi Padawan Barriss Offee onboard the Republic medical frigate TB-73. Jedi Padawan Ahsoka Tano was able to prevent the infection from spreading further by using extremely low temperatures to combat the worms, saving Offee and most of the troopers.[3]


A clone trooper being infected by a brain worm.


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