Echoes and Effigies

While charting a stellar nursery, the USS Sojourner is scanned by a mysterious alien vessel that suddenly appears from the mists. Ignoring all attempts to communicate, the vessel completes its scan and leaves as quickly as it appeared. Without further contact with the ship, all the crew of the Sojo can do is return to their mission. That is, at least, until strange happenings begin affecting the ship and its denizens. People start seeing doubles of themselves roaming the halls of the Sojo and the Captain is giving potentially dangerous orders that make no sense. The crew of the Sojo must plumb the mystery for all its worth or face potential destruction by their very own starship.