Which star of Doctor Who also played the title role in the first "Carry On" film?
Correct answer: William Hartnell

I am not a number.
Tom, that picture is in sequence from left to right, starting with William Hartnell, then Patrick Troughton through to Matt Smith. There are at least 4 more actors to portray The Doctor since then too.

I am not a number.
Tom, the one with the hat is Sylvester McCoy.

Tom
Is he the fourth from the right, with the hat?

Tom
is he the fifth from the right? with the hat.