What has Made Doctor Who Who He is in the Last 50 Years Being Played by 11 Different Men?

Seriously, I have no clue.  Why?  Because I don’t watch the Doctor but there are a ton of fans of this series.

From PBS Idea Channel,

It’s the 50th anniversary of Doctor Who!!! Whovians everywhere are excited to see what the newest Doctor will bring to the character, and that got us thinking: what makes the Doctor, THE Doctor? 11 different doctors have played the role over the past 50 years, and each was unique, with different personalities and characteristics. But besides the physical symbols surrounding him – the Tardis, the sonic screwdriver- are there larger cues that indicate the man is in fact THE DOCTOR? Watch the episode and find out!