The episode begins with a fairly weighty discussion on the morality of time travel, and the possibility that the TARDIS has been spreading deadly germs throughout time and space. ‘I don’t want to think about it, it’s too horrifying,’ says the Doctor, closing down any further discussion. So the question is never resolved. To an extent, it’s slightly pointless to raise such a significant idea only to leave it hanging, and I wonder if it’s part of an effort by Wiles and Tosh to question the ethics of the Doctor’s travels. As with The Family of Blood 40 years later, the audience is asked to consider if the Doctor didn’t land here, on a whim, would anybody have died? Neither Wiles nor RTD has an easy answer, but it’s clearly an idea that’s unsettled both.
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