The Destroyer

The Destroyer, Lord of Darkness and Eater of Worlds was demonic entity summoned by Morgaine to aid her in defeating the Doctor and conquering the world. He was a highly dangerous entity, and even Morgaine was hesitant to release him. He was bound in silver, which was his only known weakness. He was able to destroy matter with a green energy and could also teleport.

During the final battle for Excalibur, Morgaine attempted to threaten Ace and Shou Yuing with the Destroyer, claiming they would become his handmaidens. Though they didn't give in, the Destroyer was still able to destroy the hotel, even in his weakened state. Morgaine was able to escape with the sword and the Destroyer teleported them to her castle. The Destroyer let the Doctor and the Brigadier follow them, since Morgaine would then be forced to release him. When the Doctor gained the upper hand, Morgaine was forced to release the Destroyer and escaped.

The Destroyer planned to devour Earth and then all other planets, but the Brigadier was able to kill him with silver bullets. (DW: Battlefield)


 * The Destroyer may be related to the Beast, another demonic entity that was sealed away to stop its destruction of the universe.