John (Remembrance of the Daleks)

John was a Jamaican employee at a coffee shop in London in 1963. After ordering a cup of tea, the Doctor asked him where the shop's owner Harry was, then pointed out his wife was about to give birth to twins.

John chatted with the Seventh Doctor about adding sugar to tea, leading the Doctor to muse about the larger ripple effects that occur through time even from small decisions. John's father had worked in the sugar fields in Jamaica. (TV: Remembrance of the Daleks) On discussing the ripple effect, John muses that had no one like sugar, his grandfather wouldn't have been enslaved and sent to Kingston to start the sugar business and that their entire family line would have stayed in Africa. When the Doctor laments on the decisions made, John gave him the most practical advice "Life's like that. Best thing is just to get on with it."

Behind the scenes

 * John's name was never given on-screen, only in the credits.