After their collective ordeal in Ancient China, the Doctor received a mysterious signal... which turned out to be from his future self! Though the Tenth Doctor won't remember the exact details of their meeting, the warning from the future will linger... Having abandoned Gabby and Cindy in London at the house of an old friend, it turns out the Doctor may have left more problems than solutions in his wake - as Gabby's powers began to manifest on an unprecedented scale!