The Doctor gets a inter-time call from River Song who is trying to stop a spaceship transporting a Weeping Angel.
I always like it when a writer includes something that is significant that we, the audience, don’t realise is significant until it’s pointed out to us; at which point we wonder why we didn’t register it ourselves. Steven Moffat delivers that here (SPOILER the alien planet we’re on this week has aliens with two heads) and it one of a number of quality pieces of business through the double episode. There is a great gag regarding the noise the TARDIS makes when it arrives somewhere (SPOILER the Doctor keep leaving the brakes on). The cliffhanger for the first part is also brilliantly written as the Doctor points out the one thing you should never, ever put in a trap and, remarkably, Moffat comes up with an equally brilliant escape (SPOILER "Jump!") as the start of the second part. Like The Doctor himself, I’m not too sure about the 21st-century sexuality that pops up at the end. Sadly, it’s a sign of the times.
This Doctor Who episode contains adult dialogue and unpleasant and scary scenes.