The Doctor is a character encountered in We Happy Few.
The doctor is a mysterious man who's dressed with a long very dark green jacket, yellow rain boots, green fedora hat and glasses. He's first seen at the beginning of the game, in Hopkin Jones' office, sedating the young man who has forgot to take his Joy. After the doctor realizes that the man greets Arthur Hastings, who has been watching for all the time through the window, he covers it with the curtain to hide his operation.
The doctor is also seen at Raven's Holm Bridge, in the second island of the Garden District, where he controls people if they're on Joy or are infected before letting them pass to the next island.