Yesterday, the 50th-anniversary episode of Doctor Who, simulcast around the globe. Today, the premiere of The Eleventh Doctor, the latest in the series of documentary salutes to the various incarnations of this long-running British institution. Doctor No. 11 is played by Matt Smith – and since the Doctor is supposed to have a total of only 12 incarnations, this documentary series, like the series itself, should come to an end very soon. But it won’t. Expect a loophole of cosmic proportions. Literally.