Doctor (Zygon: When Being You Just Isn't Enough)

A doctor was one of Lauren Anderson's colleagues at St Kitts Hospital, and was present when she and Kritakh brought in Michael Kirkwood and Bob Calhoun. He was quick to realise Kritakh and Kirkwood looked-a-like, but Kritakh put him at ease by claiming they were twins.

The doctor was later among those killed by Torlakh when he disguised himself as Lauren to frame her for murder. (HOMEVID:  Zygon: When Being You Just Isn't Enough)