Series and Movies…
I’m not sure you can really class it as having series, but there have been 7 different Doctors on the tv serial and it was seasonal so I suppose you could divide it up either way.
There have been three movies as I recall, the recent one with the ‘eigth’ doctor played by one of the McGan brothers and the two old Dalek films (‘Dr Who and the Daleks’ and ‘the Dalek Invision of Earth’ I Think?) that bore little relation to the series (I can’t remember exact details but at one of them had Roy ‘Record Breakers’ Castle in it and I think Peter Cushing as the Dr?)
The 7 acors from the series were
William Hartnel
Patrick Troughton
Jon ‘Worzel Gummage’ Pertwee
Tom Baker
Peter ‘DIsh of the Day’ Davison
Colin Baker
Sylvester McCoy
The 1st Dr was played by Richard Hurndall in ‘The Five Doctors’ as Bill had already died at that time (he was already ill for the filming of ‘the Three Doctors’ so only had a minor part). Incidentally, Tom Bakers appearances in ,the Five Doctors, were all stock footage, from the unbroadcast episode ‘Shada’.
There have been a couple of specials.. ‘K9 and Company’ which I have read but never seen which didn’t feature the Dr at all and some charity specials such as the Dr Who/Eastenders crossover presented in 3D and the more recent ‘Curse of Fatal Death’ spoof.