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One of the more interesting aspects of the character was his ability to regenerate himself into a new physical form when the need arose.
This was particulary handy for the show's producers of course, as when one actor "outgrew" the role, for a variety of reasons, they simply "regenerated" him in the guise of a different actor!
This brilliant idea led to a succession of different doctors over the years.  Eight in the original series to be precise....
Of course, everyone who ever watched the show has their own favorite doctor...
Who was yours?
Below, you will find a listing of all the doctors, and the years they played the role, all the way from the very first appearance, thru to the new guy on the block.
....ten if you count the new ones just on the scene!
...My favorite was number 4...Tom Baker!
...and they were all as different as the actors who portrayed him...
Of course along with the new physical appearance there would be some changes in personality as well...but never so much as to say they weren't still the doctor!
First incarnation: William Hartnell   1963 - 1966
Second incarnation: Patrick Troughton 1966 -m 1969
Third incarnation: Jon Pertwee 1970 - 1974
Fourth incarnation: Tom Baker 1974 - 1981
Fifth incarnation: Peter Davison 1981 - 1984
Sixth incarnation: Colin Baker 1984 - 1986
Seventh incarnation: Sylvester McCoy 1987 - 1989
Eighth incarnation: Paul McGann (the 1996 movie)
Ninth incarnation: Christopher Eccleston 2005
Tenth incarnation: David Tennant 2006.....
Of course, a whos who would not be complete without a list of the hero's brave companions in the adventure...or...
the villains!
~The Companions ~
� Carole Ann Ford (Susan Foreman 1963-1964)
� William Russell (Ian Chesterton 1963-1965)
� Jacqueline Hill (Barbara Wright 1963-1965)
� Maureen O'Brien (Vicki 1965)
� Peter Purves (Steven Taylor 1965-1966)
� Adrienne Hill (Katarina 1965) 
� Jean Marsh (Sara Kingdom 1965-1966)
� Jackie Lane (Dorothea "Dodo" Chaplet 1966) 
� Anneke Wills (Polly Wright 1966-1967)
� Michael Craze (Ben Jackson 1966-1967)
� Frazer Hines (Jamie McCrimmon 1966-1969)
� Deborah Watling (Victoria Waterfield 1967-1968) 
� Wendy Padbury (Zoe Herriot 1968-1969) 
� Caroline John (Elizabeth "Liz" Shaw 1970)
� Katy Manning (Josephine "Jo" Grant 1971-1973) 
� Elisabeth Sladen (Sarah Jane Smith 1973-1976)
� Ian Marter (Harry Sullivan 1974-1975)
� Louise Jameson (Leela 1977-1978)
� K9 (1977-1981) 3 pics 28Aug98
� Mary Tamm ("Romana" 1978-1979)
� Lalla Ward ("Romana" 1978-1979)
� Matthew Waterhouse (Adric 1980-1982)
� Sarah Sutton (Nyssa 1981-1983)
� Janet Fielding (Tegan Jovanka 1981-1984)
� Mark Strickson (Vislor Turlough 1983-1984)
� Kamelion (1983-1984)
� Nicola Bryant (Perpugilliam "Peri" Brown 1984-1986)
� Bonnie Langford (Melanie "Mel" Bush 1986-1987) 
� Sophie Aldred (Dorothy "Ace" 1987-1989) 
� Daphne Ashbrook (Dr Grace Holloway 1996)
� Billie Piper (Rose Tyler 2005-2006)
� Roger Delgado (The Master 1970-1973)
� Peter Pratt and Geoffrey Beevers (The Master 1976 and 1981)
� Anthony Ainley (The Master 1979-1989)
� Eric Roberts (The Master 1996)
~The Villains ~
� David Banks (Cyberleader 1982-1988)
� Kate O'Mara (The Rani 1986-1993)
~Other Supporting Cast Members ~
� Nicholas Courtney (Brigadier Lethbridge-Stewart 1969-1989)
� Richard Franklin (Captain Mike Yates 1970-1973)
� John Levene (Sergeant John Benton 1969-1975)
� Fernanda Marlowe (Corporal Bell 1971)
� Richard Hurndall (First Doctor 1983)
� Gerald Flood (voice of Kamelion 1983-1984)
� John Leeson (voice of K9 1977-1981)
� David Brierly (voice of K9 1979-1980)
� David Banks (Cyberleader 1982-1988)
� Lisa Bowerman (voice of Bernice Summerfield 1997-)
Note:  I must give credit where credit is due, and much of this information I got from the Dr.Who Image Archives
I encourage you to visit this site for more detailed information, and lots and lots of pictures.
drop us a line
Credit is also due to the following sites for the terrific sound clips.
2005
2006
...ask any fan and they'll tell you which one was the "best"...
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