A huge creature which thrived on death and destruction. If kept in silver chains, it could do little, but when Morgaine brought it to Earth, she freed it, hoping to force her old enemy, Arthur, into the open. Despite the Doctor telling Morgaine that Arthur was dead, Morgaine instructed the Destroyer to kill everything. The Brigadier shot the Destroyer with silver bullets. All the unreleased force was turned back inwards and the Destroyer was destroyed.