Inevitably given Doctor Who's massive global reach, fans of the show are obsessive (in a good way) and are desperate to know everything possible about the show which they love. A show rich in mythology, there is much that is known about Doctor Who. The majority of the show's obsessive fans do know much and more about the programme, yet there is so much trivia about the show swirling across the internet which many (probably) haven't come across before. Following is a list compiled of 20 facts which you may not know, detailing the very first episode, the very first Doctor and how the Sontarans came to be so named. Some of these factoids come from interviews, autobiographies and designs, and some of them are common sense really. If you think about it, that is. Admittedly they can take a while to get your head around. If youre a dedicated fan of the show youll probably have heard of most of these anyway, but hopefully some of these will surprise you. Both the classic and the new series are covered so there should be a nugget of newness amongst the following facts.