Captain (The Curse of the Black Spot)

This Alien was on board an unnamed ship that crashed on the Fancy in the 17th century.

History
This alien was onboard a ship that crashed on the Fancy in another dimension. This crew member, along with the rest of the crew, caught a human disease and died. The Virtual Medic onboard had no patients to care for, so it took a human form and started taking Pirates. (DW: The Curse of the Black Spot)

Behind the scenes

 * Although not named in the episode, the alien's shoulder had the abreviation D.I.H.S. on it, which may be of some relation to either the unnamed ship or the species.