With season 12 of Grey's Anatomy due to screen very soon, promising massive changes in the wake of season 11's heart-breaking and stunning climax, it's about time for fans to start getting excited for the return to the Grey-Sloan Memorial Hospital. How times have changed since the early days when Meredith, Christina, George, Izzie and Alex turned up as fresh-faced interns under Dr Bailey's supervision. The team have grown up, split apart - whether for new jobs or tragic reasons - and formed new relationships, but the dynamic in the hospital and the show remains the same. Fans watch because of the emotional stakes: characters love, laugh, mourn and occasionally die together in the pressure cooker environment of an intensely busy hospital, and even after ten seasons, the pleasure in that simply does not diminish. Yes, it can be an ordeal watching (particularly given Shonda Rhimes' fondness for killing characters for dramatic effect), but the rewards are just as pronounced. And because there is so much love for the show, there's always fascination in peeling back the layers and looking behind the show's curtain with fan-pleasing behind the scenes shots...