Howling:Why regenerate?

Have just been rewatching 'The Sound of Drums' where the Doctor talks about the role of the Timelord. "Watching over the galaxies below...never interfering."

Which raises the question? Why would they need such an elongated life? We don't know how Hartnell was but we can assume they already had one life longer than human life? Why twelve more shots of that if all they were were a race of observers?

--TheMasterRace ☎  18:22, March 1, 2014 (UTC)