Also played Robot Dr. Who (2nd picture)
The Chase episodes 4 and 5.
12–19 June 1965
Audio: Minuet in Hell (April 2001)
Peter Capaldi (also the man from Pompeii)
25 December 2013 -
Unknown incarnation: John Hurt
From episodes Name Of The Doctor and The Day Of The Doctor
18 May 2013 - 23 November 2013
Banto Zame (a con-man claiming to be the Doctor): Christopher Biggins
Audio: The One Doctor
17 December 2001
Martin Bannister (delusional script writer): Derek Jacobi
Believes he’s the doctor.
Donna Noble a.k.a. Doctor-Donna: Catherine Tate
5 July 2008
Absorbs part of the doctor's memories and intelligence.
Jackson Lake: David Morrissey
"The Next Doctor"
25 December 2008
Believes he is the Doctor and the 10th Doctor briefly believes Jackson is a future incarnation of himself.