Any other characters we've seen that anyone would like to come back as a companion?
I actually liked the American episodes. Here we have access to the whole of time and space, but all he used it for was visiting space in the future and contemporary London and occasionally London in the past, with very few exceptions.
There's the whole of Earth and the whole of human history, to name just one planet alone. In the new series I think he's only ever gone to space in the past once (not including any NASA bits from the last sixty years). And that was to see the Earth's accretion disk.
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