I initially found this tale a little frustrating, because where so many actors and actresses retain the same or similar voice throughout their life, Deborah Watling's has changed considerably. Unfortunately I could not always believe it was a young Waterfield she was playing. However, that aside, Watling, playing alongside Frazer Hines enact a very good tale. It gets better as it goes along, and does compare favourably to the narrative of the time.
Some Companion Chronicles do not sustain their interest to the end, but this one did because it had a nice twist. It is quite appropriate too that the Doctor should be taken for an immortal. This series has the Doctor in a more incidental role, which therefore gives the companion more to do living up to the name of the range. The Emperor of Eternity is a tale of good concepts and a worthwhile listen. It is nice to have a short historical tale and very welcome to have a contribution from Nigel Robinson, who edited and contributed to the Target range of Doctor Who novels in the 1980s.