It's hard to move on from David Tennant, many people still haven't. But if you needed the show to convince you it was still going to be amazing, possibly even better than ever, then Matt Smith, Karen Gillian and Steven Moffat have easily provided that with this episode. Not many Doctor's get an introduction as bold and committed as this one, only 'The Power of the Daleks', 'Spearhead from Space' and 'The Giggle' even come close.