Jeremy Fitzoliver

Jeremy Fitzoliver was an upper-class photographer and occasional companion of the Third Doctor.

Biography
Fitzoliver was not popular at the Metropolitan magazine. Sarah Jane herself could barely stand him. He got the job mainly because his father was a majority shareholder of the magazine's publisher. (PDA: Island of Death) He first got involved with the Doctor's affairs through his colleague, Sarah Jane Smith. (BBCR: The Paradise of Death)

It is hinted that he lost his memory messing around with one of the Doctor's inventions and that he became the antagonist "John Doe". (PDA: Instruments of Darkness)