Malladus

The Demon King is the antagonist of The Legend of Zelda: Spirit Tracks. Before the game, the Demon King ruled over new Hyrule, but was defeated, in an epic battle. Though he wasn't killed, the people musterd just enough strength and energy to subdue him with chains and shackles and bury him underground.

During Spirit Tracks, Cole attempts to revive the Demon King, and Link has to stop him.