IGN:
Much has been made this season about the ability to sum up an episode's selling point in a movie poster.
But bugger the tagline and sexy promo image - it's the title of Steve Thompson's fanboy-baiting, traumatically timey-wimey tale that most titillated.
This episode sums up why Doctor Who should be allowed 2/3 even 4 part stories.
The concept of a journey into the very depths of the TARDIS could easily, imo, support almost half a series, and surely deserves much more time than 45 mins with a crammed in ending.
Next week's episode looks like the epitome of filler. This should have been a 2-parter at the very least.