Lord Slug (スラッグ) is a Namekian, and the antagonist of the movie Dragon Ball Z: Lord Slug.
It is explained that he is one of the Super Nameks and was sent to Planet Slug as a baby to escape the extinction that was about to ravage Namek. As he matured, the evil in his heart began to overwhelm his character thanks to a rare mutation unique to Namekians; this transformed him into a Super Namek. Since then, he had gathered an army and became a conqueror of planets (in FUNimation's dub, he was banished from Namek sometime around Age 261 along with other Super Namekians).