David Tennant turns 44 years old this week and he became an honorary household name when he was introduced to the nation - and subsequently the entire world - as the Tenth Doctor in Doctor Who. Although he will always be known and beloved by an entire generation for his popular portrayal of the world's most iconic universal defender, the Scottish star is so much more than just a Time Lord. He's a Death Eater, too, as well as a part time vampire killer turned TV's favourite detective, and let's not forget his memorable jaunt as history's most notorious prowling sex pest... Yep, you can say what you like about David but you can't deny that he's as versatile as actors come. In fact, 'Versatile' is his middle name (Spoilers: It's actually John) and, as an award winning actor of the stage and screen (both big and small), David has established himself as a formidable force to be reckoned with, so much so that he was awarded with a prestigious Special Recognition gong at the National TV Awards earlier this year. His ever growing reputable résumé (as you read this, for example, he is currently filming a new Marvel series for Netflix!) is bursting with so many visual delights that it can be difficult to know where to begin. Luckily for you, here's a countdown of just 10 of his most defining performances that you definitely have to see. That is, if you haven't already.