Re: Been thinking its time to try Doctor Who
Traveling in time and fighting aliens is little different than traveling from planet to planet and fighting aliens.
And strictly speaking it's one series. (1963-1989, 96 and 2005-).
But a good place to start would be the first episode of the 2005- run "Rose".
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.