Occam's Doctor

"Occam's Doctor" is the title of my new spec script for Dr. Who, packed off recently to BBC Wales. In it, the Doctor discovers to his horror that he can't actually travel through time at all - he is just a being with a strange tendency to make discontinuous jumps through space, arriving at each new spatial location with a brand new set of beliefs about what has recently happened to him. He only appears to be travelling through time because of the curious non-continuous narrative style in which his adventures are presented to us, full of flashbacks and flash-forwards; actually they all happen in a perfectly normal temporal order.

In the end, Professor David Lewis turns out to be a shape-shifting alien. (Update: Of course this should come as no surprise, as everyone knows that there are possible worlds in which he's been a shape-shifting alien all along.)
(Update: It's not really very spectacular, btw: all that happens is that they discover that the predicate "is Professor David Lewis" refers to David Lewis at times up to time T, and to a Sontaran thereafter. I wish I'd made it more televisual in retrospect - the new series seems to have a much bigger fx budget).