This page requires a dab term due to a conflict with First Officer (*Sub Zero). It should be taken into account that there are two "First Officer" characters in the story.
Talk about it here.
The First Officer was an Eternal who served on the Shadow under Captain Striker when they competed for Enlightenment. He retrieved the Fifth Doctor, Tegan and Turlough from the ship's hold when they attempted to return to the TARDIS. (TV: Enlightenment)