" Oh, how I wish I had already regenerated to become the tall one with the dicky bow, thought the Doctor, who occasionally had visions of his future selves. He is always so fit and agile. I suppose all that incessant running down corridors that he does . . . will do . . . may do, in one of my possible futures . . . is good for something. "

― Eoin Colfer , A Big Hand for the Doctor (Doctor Who 50th Anniversary E-Shorts, #1)