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Wikipedia on the Face of Boe
Possible origin
In the episode "Last of the Time Lords", the immortal time traveller Captain Jack Harkness expresses concern about how he might look if he lives "for a million years", because although he cannot die, he is still aging, albeit slowly. He tells the Doctor and Martha Jones that it's a matter of vanity, because as the first person from the Boeshane Peninsula to join the Time Agency, he was featured on posters, becoming known as "the Face of Boe". The implication of this astonishes Martha and the skeptical Doctor.
Writer Russell T Davies, in the episode's commentary, called the implication of this scene "a theory" as to the Face of Boe's origins, prompting Executive Producer Julie Gardner to urge him to "stop back-pedaling" about the two characters being the same. Davies also said that after writing the scene he inserted a line in the ADR recording for "Gridlock" in which the Face of Boe calls the Doctor "old friend".[1] However, Davies does not like making the relationship explicit, stating "the moment it became very true or very false, the joke dies". He has refused the publication of spin-off novels and comic books that have tried to definitively link the two.[2]