Slug

Slug, or Lord Slug, was a Namekian war lord who flew around space, subjugating planets and conquering them.

He was responsible for a particularly nasty invasion and occupation of Earth which involved blocking out the sun, freezing the Earth. This attack likely killed millions and had extreme and severe complications for the people of Earth. He was one the most evil of evil doers and a deadly foe.

He was also one of the leading causes of workplace deaths among his crew.

Bio
While his origins are unknown, he is unlike most other Namekians in that he relishes violence and death, as well as possessing a yearning desire for power.

It is possible that the unhappiness, inate to all natives of that unhappy world drove him to such a sick and twisted fate. Of course, it is just as likely that Slug is simply, and truly, an asshole.

At some point he founded a crew of anemic, rickets suffering, vampiric freaks that could not tolerate sun. These "elite soldiers" primarily did nothing, aside from four soldiers, one of whom was executed by Slug himself for telling a hard truth about his age, a fat Sean Connery impersonator who was killed by Big Green, an effeminate demon and a Green Midget doing a poor Elmo impersonation, both of whom were killed simultaneously by Goku.