This is a quick page which would answer FAQs, if I had any. (Which, of course, I don't.)
For the purpose of this guide, the following are all canon:
- The 26 seasons of the original series from 1963 to 1989. (Doctors 1 through 7)
- The 1996 movie (Doctor 8)
- The revived series from 2005 to present. (Doctors 9 and 10)
The K-9 and Company pilot in 1981 (featuring Sarah Jane Smith and K9)
- Torchwood from 2006 to present. (featuring Captain Jack Harkness and, occasionally, Martha Jones)
- The Sarah Jane Adventures from 2007 to present (featuring Sarah Jane Smith and K9)
The 30th anniversary special, "Dimensions in Time" in 1993. (Featured the 3rd, 4th, 5th, 6th, and 7th doctors with companions Ace, Susan Foreman, Sarah Jane Smith, Mel Bush, Peri, Nyssa, Romana, Victoria Waterfield, Leela, and K-9.)
The 2005 Children in Need special featuring the 9th Doctor regenerating into the 10th (Recapped in brief in "The Christmas Invasion".)
The 2007 Children in Need special, "Time Crash", featuring the 10th Doctor meeting the 5th (between "Last of the Time Lords" and "Voyage of the Damned")
The 2008 proms special, "Music of the Spheres" (10th doctor)
"Downtime", a 1993 semi-official film which included Sarah Jane Smith and Victoria Waterfield (other semi-official movies feature Doctor Who characters, and even semi-companions like the Brigadier and Liz Shaw, but are not listed here because they include neither official Doctors nor companions.)