Ment
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The Doctor should cost not 1, but some normal number, approximately corresponding to the rating of the series. The First Doctor passes on something to the Second Doctor, and so on. The Last Doctor passes on something to the Time-Shift and reduces the cost to zero.
Just in case, it's a joke; obviously, there are too many Doctors for that...
Just in case, it's a joke; obviously, there are too many Doctors for that...