Spoilers for the end of Series Two of Doctor Who if you follow the link...

Paul Cornell's House of Awkwardness: Doctor Who: Jackie Tyler Leaves the TV On: "Indeed, it could be said that if at the heart of science fiction is 'cognitive estrangement', that is: we're way far from home and boggling at the huge new ideas we'e been thrown into the middle of, then Doctor Who, particularly but not entirely in its new incarnation, isn't actually SF."