The beloved British sci-fi series follows a character named the Doctor — a Time Lord who travels throughout the universe in a time-traveling spaceship called the TARDIS To date, there have been 15 ...

[showhide] Hartnell’s Doctor was a more severe version, starting off cantankerous and scientific, but ending the role more grandfatherly (and still very scientific). Known for childish antics and ...

Unsurprisingly, most actors want to know what they're signing up for before making a long-term (or short-term) commitment.