Hartnell's name was read out on a computer display of the Raymond family's genealogy, along with others such as Colin Baker, Tom Baker, Peter Davidson, Jon Pertwee, and Patrick Troughton. (TNG: "The Neutral Zone" , okudagram) This character was only mentioned in writing. William Hartnell is a reference to British actor William Hartnell who played the first incarnation of "The Doctor" in the long-running British science fiction series Doctor Who.