It's always something of a crap shoot when Doctor Who tries something different. If history has taught us anything, it's that experimental episodes either knock it out of the park ('Blink', 'Turn Left'), or make us wish that someone had knocked us out in a park ('Sleep No More', 'Love and Monsters'). What good could possibly come from an episode filmed in a single location, and with only one speaking character? Plenty, as it happens. With an extended running time of 55 minutes, this was a gripping tale of mystery, personal loss, and what happens when you punch an azbantium wall for over two billion years with your bare fists.
