Some Theories on Capaldi’s Familiar Face
*some speculations are contributed by Jesse Funk*
Now that Peter Capaldi is taking the reigns one of the major sticking points with some fans is that he has previously appeared in Doctor Who as Caecilius in “The Fires of Pompeii” during David Tennant’s reign as the Doctor. More notably he appeared in Torchwood as a major plot character named John Frobisher during the short Series 3 run, “Children of Earth.” Russell T Davies and Steven Moffat have apparently had some sort of brain-trust on why it is that Capaldi can appear in the Whoniverse as other characters and the Doctor which is going to play into the upcoming series. Like all good fans we want to speculate on what this could be, so I’d like to humbly offer some possible theories of explanation as a fellow fan of both Who and Torchwood.
*Spoilers Alert*
The majority of this post is going to center around Capaldi’s character John Frobisher in Torchwood, so if you haven’t seen the show and want to this is your point of no return as there will be spoilers in the upcoming sections. Personally I suggest going to watch the first three series of Torchwood to get caught up and returning to this post, but that’s just me. There will also most likely be minor spoilers for Who episodes as well if you aren’t entirely up to date yet. Additionally as a note about Torchwood, it is an adult-oriented show versus the family orientation of Who so some of the plot discussed from Torchwood may not be appropriate for younger viewers. I believe most people reading this will be old enough, but just to cover my bases I figured a little disclosure was needed. Read on as you will.
Theory #1 – The Doctor takes someone else’s face from history

One of the more easily placed theories I’ve heard about is that the Doctor’s faces have to come from somewhere so he takes them from people in history. After the 50th anniversary episode and the Series 7 finale we found out an important possibility about the Doctor’s regenerations. Simply put, that there is some degree of ability to choose the temperament of his next incarnation.
The Eleventh Doctor talks about his previous incarnations mentioning the Tenth incarnation and how he regenerated to the same face because he was vain at the time. Additionally the Sisters of Karn helped the 8th Doctor regenerate into a warrior to be the War Doctor so this seems to be enough precedent to say it’s a possible plot add on. Because Doctor Who isn’t entirely “hard scifi” i.e. doesn’t always obey the rules it lays down, anything could really happen here.
Supposing that the Doctor has the ability to take the face of someone from history rather than create his own face the next question is why John Frobisher and/or Caecilius? We know that the Doctor loves humans as fallible, hopeful, wonderful creatures. Given this I would suggest that he takes the appearance of Caecilius since we know they have met. Caecilius had an obvious affection for the TARDIS which may partially make him stand out in the Doctor’s mind over time. He may also remember that it was Donna that urged him to save Caecilius and his family so his friendly affection for the plucky girl from Chiswick could be affecting this incarnation.
I would posit that it’s unlikely that the plot would say he would take the face of John Frobisher. The Doctor never officially appears in Series 3 of Torchwood despite Gwen Cooper’s mention of him and the lack of his presence. Theoretically it’s possible that the Doctor would know of John Frobisher as the man responsible for interacting with the 456 on behalf of the human race. For me it would take some really good writing (i.e. finagling of the story) to get me to believe the Doctor is using his regeneration as a memorial for a man he never knew that met an untimely demise.