Cui was a powerful fighter among Frieza's henchmen and the overseer of Frieza Planet 79. He killed Boon's family when Frieza's forces attacked the youth's homeworld. An arrogant, purple fish-faced braggart, Cui disliked his old rival Vegeta, and believed himself much stronger than the Saiyan. When Vegeta went renegade, Cui followed him to Namek under orders from Frieza to eliminate him. However, Vegeta had grown much stronger since his battle on Earth with Goku, and he easily killed Cui.