Drakos
From Tardis Wiki, the free Doctor Who reference
Drakos, known as Ctislav Drak when in human form, was a Drak. He once challenged the Doctor to a battle for the Earth. He won the first battle, at chess, and made a deal with the Doctor: several centuries later, the second battle, a culinary one, took place between Drak and the Fourth Doctor. (PROSE: The Dragons of Prague)