The Doctor has changed appearance ten distinct times. These are the eleven faces of the Doctor.
(Top)
L-R: William
Hartnell,
Patrick
Troughton,
Jon
Pertwee,
Tom
Baker
(Middle)
L-R: Peter
Davison,
Colin
Baker,
Sylvester
McCoy, Paul
McGann
(Bottom)
L-R: Christopher
Eccleston,
David
Tennant,
Matt
Smith