Initially a well-intentioned, though somewhat arrogant, administrator for Hyperion Corporation, Jack becomes consumed by power and greed after discovering the Vault and the Warrior; a powerful creature within it. He declares himself dictator of Pandora, manipulates events to appear as a hero, and seeks to eliminate all "criminals" on Pandora (which, in his view, includes the majority of its population). His descent into madness and ruthless ambition make him a memorable and compelling villain.