John Damage as being the voice of The Great Dragon, the final of his sort following Uther destroys all of his kin and can make an example outside of him by imprisoning him in an enormous cave. The good Dragon provides Merlin grudging advice and forges the sword of Excalibur http://sense8seasons1-232962.look4blog.com/13451633/the-2-minute-rule-for-merlin-box-set-seasons-1-5