Category:Necessary Evil

"Without its master's command, the restless Scourge will become an even greater threat to this world. Control must be maintained. There must always be... a Lich King!"

- King Terenas Menethil II

Villains that can actually serve very important purposes and need to be kept alive, imprisoned or simply kept around. These villains cannot be destroyed or something terrible can happen.

An example is the Galactus. While he may devour many planets, he is actually needed to prevent the end of the Marvel Universe.