Upon encountering the Doctor in 1979, Wilkin amazed the Doctor by immediately remembering not only his name, but the fact that he had taken an honorary degree in 1960 and had previously visited Professor Chronotis in 1964, 1960, and 1955. The Doctor responded that he'd also been to the college in 1958, albeit in a different body; Wilkin took this is as a joke. (Accounts differed as to whether the Doctor was in his fourth or eighth incarnation during this visit and the others specified by Wilkin.)