As fantastic as Steven Moffat's scripts are, nobody can ignore his tendency to introduce mind-boggling story arcs that are ultimately written off (if, that is, they're even properly explained at all) in a passing line, as this example just proves. During Series 6 it was revealed that the Amy Pond aboard the TARDIS had actually been a doppelgänger version as part of Madame Kovarian's far reaching - and, let's face it, truly exhaustive - plan to kidnap her baby and turn her into a psychopathic killing machine. Lots of other stuff went down in the build up to this momentous development, of course, but that's the general gist of it. So, for the sake of clarification, whilst Amy's flesh counterpart was facing the Silence in America (The Impossible Astronaut/Day of the Moon), swashbuckling pirates aboard The Fancy (The Curse of the Black Spot) and getting caught up in all kinds of timey-wimey nonsense at the hands of the malevolent House (The Doctor's Wife), the real Amy was off in some laboratory somewhere where her pregnancy was being monitored by an evil eye patch lady who was conditioning her unborn child to become the ultimate killing machine. Only in Doctor Who, eh? So when did Amy actually become the doppelgänger, then? It's vaguely suggested in the passing (A Good Man Goes To War) that she must have been taken at some point before their US adventure but that's annoyingly the first and last time it was ever mentioned. After all, why would they talk about? Being kidnapped and replaced by an avatar version of yourself is hardly a big deal these days, is it? It happens to everyone... but why couldn't Amy have been as desperate for answers as the rest of us!?