Dronad

Dronads are a species briefly seen in the original version of The Dreamer Wakes, when the Doctor sees a female walking with Jani Bodmann in a garden that the Time Lord cannot recognize.

The author felt this left a loose end, changing its species to Gem'ickian; this in turn reflected the fact that the Doctor was not present for the events following Allura's Gambit, and hence did not recognize Gem'ick.