David Troughton is the son of Second Doctor, Patrick Troughton. He's not directly related to new series director Alice Troughton, though! After Georgia Moffett, he's the second progeny of a past ...

Their fight is such an astonishing event that Troughton looks absolutely dumbfounded, while Wendy Padbury is so out of breath she fluffs her next line. Perhaps the Doctor isn't at his brilliant best.