Derek (Bite of the Morphuse!)

Derek was the name of an alien 'accaquaintance' of the Doctor who was "the best Elvis tribute act in the cosmos". Caught out by the Doctor doing a gig in Detroit in 1970, he obliged the Doctor by capturing (using his ships teleporters), a gang of Morpuse that he agreeed to drop off safely on an alien planet. (COMIC: Bite of the Morphuse!)