This is the fouth part of a five part series about the actors who have played the character of Dr Who in the hugely popular BBC series. In Part One, we looked at William Hartnell, Patrick Troughton and Jon Pertwee. In the second article, we put Tom Baker, Peter Davison and Colin Baker under the InfoBarrel microscope. Next were Sylvester McCoy, Paul McGann and Christopher Eccleston. Now we meet David Tennant and Matt Smith. There are some surprising facts about each actor that you may not know!