Together they find themselves in Sixties America, battling the invasion the world forgot, then journey on the high seas of 1696 aboard a pirate ship, to solve the mystery of the Siren. In a bubble universe at the very edge of reality, the Doctor meets an old friend with a new face, and in a monastery on a remote island in the near future, an industrial accident takes on a terrible human shape. They also venture across centuries and galaxies, where they encounter the greatest war criminal in all of history - and Hitler. They'll also discover there's no scarier place in the universe than a child's bedroom and a visit to an alien quarantine facility will reveal to Rory a very different side to his wife. In a hotel where walls move, corridors twist and rooms vanish, death lies waiting. But the Doctor's time has yet to come. He has one last stop to make on his final journey - an old friend needs his help and an old foe must be defeated. But time catches up with us all and the Doctor can delay no more.