Okay, some minor spoilers here, people, so be warned: From the recently revealed official synopsis, we know that the modern day sequences of Day of the Doctor
take place in 2013. It's also long been known that Kate Stewart is returning, after appearing previously in The Power of Three
. But, depending on how things go, this creates a bit of a problem: The Power of Three
was set several years in our future, around 2018 or so, and that was when Kate first met the Eleventh Doctor......so how can she meet him now, in '13?