Captain (The Curse of the Black Spot)

The Eleventh Doctor once discovered an individual who had apparently died on board a spaceship that crashed on the Fancy in the 17th century, in another dimension. This crew member, along with the rest of the crew, caught a human disease and died. The virtual medic on board had no patients to care for, so it took a human form and started taking pirates. (TV: The Curse of the Black Spot)

Behind the scenes

 * Although not named in the episode, the alien's shoulder had the abbreviation D.I.H.S. on it, which may be of some relation to either the unnamed ship or the species.
 * The Doctor Who Encyclopedia names the individual's species as the "Skerth".