48. How Long Has The Doctor Been Traveling To Earth?
The 1st Doctor cites several experiences that occurred on Earth before the events of "An Unearthly Child," including making claims that he taught the Mountain Mauler of Montana how to wrestle and gave Hans Christian Anderson the idea for The Emperor's New Clothes. The Doctor's first 4 incarnations claimed to have met Mao Tse Tung, Leonardo Da Vinci, Napoleon, Madame Nostradamus to name just a few. The argument could be made that these adventures happened "between" the televised stories but in the absence of proof, the case can certainly be made for these meetings happening prior to The Doctor's meeting with Ian and Barbara.
47. What Happened To Susan's Parents?
The Doctor has made many references to having been a father, yet he has never talked about his children. Were Susan's parent's dead? Why was the Doctor, often described as a mere adolescent in Gallifreyan terms, trusted with the care of what was probably the equivalent of a Time Lord toddler?