The Doctor has seen a glimpse of the future, and learns that his present incarnation will end soon. For a while, he sulks in his TARDIS. Then he realises he should take advantage of the time he has left. He journeys to a planet at the Dawn of Time and carves on a rock, "The Doctor was here." Lastly, the Doctor visits an old mentor, and stays with him until he passes away. The Doctor now feels he is ready to face his end, and is thankful that he had time for "all the important things".