Some logos from Doctor Who.... 1) The classic Doctor Who logo from the 1970's TV series. The 'diamond' logo appeared in blue as the logo during Jon Pertwee's portrayal of Doctor Who #3 and was used into Tom Baker's portrayal of Doctor Who #4. This multi-color version was used on various BBC merchandising and remains today as one of the most popular & recognized Doctor Who logos. 2) Military patch logo of UNIT, the British military unit that most often works with Doctor Who. 3) A modern take on the Dr. Who logo.