Retcon article
(covers information that was retroactively changed)

Jon Pertwee's name on the computer readout

Jon Pertwee was a Human who was kin to descendants of Clare Raymond.

Pertwee's name was seen on a computer display of the Raymond family's genealogy, along with others such as Colin Baker, Tom Baker, Peter Davidson, William Hartnell, and Patrick Troughton. (TNG: "The Neutral Zone", okudagram)

This character was only mentioned in writing.
Jon Pertwee is a reference to British actor Jon Pertwee who played the third incarnation of "The Doctor" in the long-running British science fiction series Doctor Who.