Brain crawler

Brain crawlers were a species of parasitic worm found on Cheelit. They could infest the brains of members of the happabore species. The instruction manual for Happy-Bore Medicated Dewormer&mdash;a product containing Trestibinexocycline 5-Gamma, thlank oil, greel-root acid and forage products, that was produced by Galacti-Stok&mdash;recommended that the dewormer not be used to treat brain crawler infestations.

Behind the scenes
Brain crawlers were first mentioned in Star Wars: Rey's Survival Guide, a replica journal written by Jason Fry and released in 2015.