Malladus

The Demon King is the name of the presumed primary antagonist of Spirit Tracks. According to details released concerning the game, the Demon King was a tyrannical despot that ruled over the new land that was discovered by Link the Hero of Winds, Tetra and the Pirates that eventually became the new land of Hyrule. After his defeat at the hands of the Hero of Winds and the last remaining descendant of the Royal Family of Hyrule, the Demon King was bound and locked away, held in his prison by a special set of chains, a series of train tracks built across the land known as the Spirit Tracks, whose existence depend upon the state of the Tower of Spirits. These tracks would expand in four directions all across the kingdom of Hyrule and eventually come to be used as a means of transportation by the general populace of Hyrule. With the Demon King's defeat, the land he once terrorized was proclaimed the new land of Hyrule, and the Hyrulean monarchy was reestablished to govern the land.

A century later, Princess Zelda comes to suspect that one of her government officials, Chancellor Cole, is involved in a plot to destroy the Spirit Tracks that hold the Demon King in his prison and to revive the ancient evil that once terrorized the land. As the tracks begin to mysteriously vanish across the land, the princess confides her suspicions of the Chancellor in Link, her close friend and the recently-named Royal Engineer to pilot the Spirit Train. Her suspicions later prove to be correct when the Chancellor abducts the princess's body, ripping her spirit from it and intending to use the body of Hyrule's princess to somehow restore the Demon King to his former strength. It is then that Link journeys across Hyrule with Princess Zelda's spirit to restore the Tower of Spirits to its former state, restore Zelda's spirit to her body, defeat the Chancellor, and ultimately stop the return of the wicked Demon King to power.

Trivia

 * The Demon King bears a strong resemblance to Ganondorf, especially in his  The Wind Waker appearance, however the connection between the two is unknown as of yet. However, the Spanish-language version of Spirit Tracks refers to him as "Mallard."