Union Fleet Captain's shoulder bars.

Ed vs Vorak

Captain Ed Mercer faces his Moclan counterpart, Vorak.

...we have 3,000 ships to staff, and we need captains.Admiral Halsey[1]
Captains serve as leading crew members of a vessel. Captain ranks below Admirals and above Commanders.

Captain is the highest-ranking stationed position on board a Union vessel, and boasts final command authority of the ship outside of orders from Union command or if deemed mentally or physically unfit. Captains have the power to command any crewmember or civilian aboard the vessel. In the early 25th century, there are roughly 3,000 active-duty Union captains.

A Captain is the final arbiter of justice within the ship, with powers to physically detain persons in the Brig.[n 1] Captains also hold the power to initiate criminal justice proceedings against their own crewmembers through court martialling. A Captain's power is not unlimited as they are subordinate to Union admirals, who oversee multiple vessels, regions, issues, or fleets; and because a captain is responsible for order on their ship, they file regular reports to admiralty. Failure to report or to misreport is a serious offense, and may be punished by a letter of reprimand or stripping outright the rank and title of the Captain.


Strictly speaking, most if not all Union officers of a higher rank seen would have been Captains. The following are those who are definitively seen as such.

Planetary UnionEdit

Union FleetEdit


Moclan FleetEdit





Trivia Edit

  • Captains have the power to perform wedding ceremonies on their ship.[23]


  1. Old Wounds
  2. Episode 1x01: Old Wounds
  3. Episode 1x01: Old Wounds
  4. Episode 2x14: The Road Not Taken
  5. Episode 1x02: Command Performance
  6. Episode 1x04: If the Stars Should Appear
  7. Episode 1.5x02: New Beginnings, Pt. 2
  8. Episode 2x05: All the World is Birthday Cake
  9. Episode 2x09: Identity, Pt. 2
  10. Episode 1x02: Command Performance
  11. Episode 1x05: Pria
  12. Episode 2x07: Deflectors
  13. Episode 1x03: About a Girl
  14. Episode 2x07: Deflectors
  15. Episode 2x12: Sanctuary
  16. Episode 1x01: Old Wounds
  17. Episode 1x06: Krill
  18. Episode 1.5x04: The Word of Avis, Pt. 2
  19. Episode 2x04: Nothing Left on Earth Excepting Fishes
  20. Episode 2x04: Nothing Left on Earth Excepting Fishes
  21. Episode 2x09: Identity, Pt. 2
  22. Episode 2x10: Blood of Patriots
  23. Episode 2x07: Deflectors

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