A brilliant take on a good old-fashioned prison escape story. What's interesting about this one is that the Doctor is without his companions, as he is arrested in the famous high security American prison and attempts to break out a friend from an unseen previous adventure. I love the art style, which is quite bleak, and the reference to Les Miserables with the alias the Doctor uses made me laugh a lot too. I just think more could have been done with the alien guards, and that it was clearer where this takes place in the Doctor's timeline (is this in-between The God Complex and Closing Time, or Closing Time and The Wedding of River Song?).