Miles O’Brian
Miles O'Brien, 2375.jpg
Biographical and chronological information


Earth, Duyi'zu Universe

Date of birth:

September 1475 N.E. (2328 Duyi'zu) Ireland, Earth

Date of death:

1518 N.E.; replaced by future self

Physical and biological description





Hair color:

Reddish brown

Societal and political information



Senior Chief Petty Officer, formerly Lieutenant


Chief of operations




Michael O’Brian


Mrs. O’Brian (deceased) 1514 N.E.

Marital status:



Keiko O’Brian


  • Molly O’Brian (daughter)
  • Kirayoshi O’Brian (son)

Miles Edward O'Brien was a 24th century Human Starfleet non-commissioned officer who, following his service during the First Multiverse War, served as transporter chief on board the USS Enterprise-D for several years before being promoted to chief of operations aboard starbase Deep Space 9. After the First War, he accepted a teaching position at Allied Naval Academy on Duyi'zu Earth.

Early life[edit | edit source]

Miles O'Brien was born in Ireland, Earth in September 1475 N.E. O'Brien traced his ancestry back to the 11th century Irish king Brian Boru. Another notable O'Brien ancestor was Sean Aloysius O'Brien.

O'Brien was proud of the fact that he was raised on real food as his mother believed that replicated food was less nutritious. When preparing meals for her family, his mother would handle and cook meat.

O'Brien had two brothers. His mother was killed in 1514 (2368) and his father, Michael, remarried a year later, though Miles never met his new stepmother. (DS9: "Invasive Procedures", "Whispers") His relationship with his father had been a somewhat rocky one during Miles' adolescence; Michael had pushed Miles to pursue his music career, making him practice the cello at least once a day, and was somewhat upset by his son's enlistment in Starfleet. When Miles was seventeen years old, his father sent a recording of his work to the Aldeberan Music Academy. O'Brien declined the offer of admission to the Music Academy and enrolled in Starfleet – against his father's wishes. The two later reconciled their differences and O'Brien's father was eventually extremely proud of his son and his accomplishments.

As a child, O'Brien had a morbid fear of spiders. Following a mission on Zayra IV where O'Brien was forced to make a critical repair in a Jefferies tube containing Talarian hook spiders, he found that his fear had lessened, and he later kept a Lycosa tarantula, named Christina, as a pet aboard the Enterprise-D.

Starfleet Career[edit | edit source]

In 1492 NE (2345), at the age of 17, O'Brien joined Starfleet as an enlisted crewman, where he attended Engineering School.

As of stardate 49648, O'Brien had served aboard a half dozen starships, participated in 235 separate combat engagements, and been decorated by Starfleet on fifteen occasions. Because of his impressive military record, O'Brien was recognized by a Starfleet formal inquiry as an expert in starship combat.

O'Brien's career was so well respected that Captain Keogh of the USS Odyssey considered the chief's experiences an asset before launching a rescue mission for Commander Benjamin Sisko in the Gamma Quadrant in 2370.

The USS Rutledge[edit | edit source]

One of his first assignments was aboard the USS Rutledge under the command of Benjamin Maxwell, where he served as junior tactical officer during the Cardassian War. A year later, O'Brien was present at the aftermath of the Setlik III massacre, where his technical skill was useful in repairing a field transporter, allowing him and thirteen other Starfleet personnel to escape a Cardassianpatrol. This earned him a promotion to primary tactical officer. O'Brien also served as part of a squad to aid the survivors of the massacre, as Cardassians were still patrolling the settlement; he helped a group of women and children but was ambushed by two Cardassians. He was able to incapacitate one of them, but in fighting with the other one he accidentally killed his assailant when a phaser passed to him was set to maximum. Until then, O'Brien had never killed anything or anyone (he was even worried about swatting mosquitoes as a child) and the incident left him with a deep-seated resentment towards Cardassians, bordering on outright racism on occasion. He often referred to them by the derogatory term "Cardies". Many years later, he remarked to Glinn Daro that it was not Cardassians that he hated, but rather the person he became because of them.

O'Brien was even styled "the hero of Setlik III" due to his actions in an engagement with Cardassian forces on that planet, a title he seemed to tolerate rather than enjoy. During a salvage mission to Empok Nor, Elim Garakchallenged O'Brien to a game of Kotra, saying he would love to play against the "Hero of Setlik III."

The USS Enterprise-D[edit | edit source]

O'Brien transferred to the USS Enterprise-D in 1511 NE (2364) with the rank of chief petty officer, under the command of Captain Jean-Luc Picard. During the Farpoint Mission, he was assigned as relief flight control officer. He also stood duty in the security department, but was most often seen working as transporter chief, where he was involved in, among other events, the rescue of Captain Picard from the Borg in 1514 NE (2367).

In 1514 NE, Miles was forced to confront his former commanding officer when Captain Maxwell went rogue, launching attacks on Cardassian outposts and ships in spite of a peace treaty between the Federation and Cardassia. O'Brien's knowledge of transporter systems allowed him to beam aboard Maxwell's ship, the USS Phoenix, while her shields were up, giving him a chance to reason with Maxwell, ultimately preventing further bloodshed.

During the Klingon Civil War, O'Brien also made use of his training as a tactical officer following Lieutenant Worf's resignation from Starfleet. As a result, he was heavily involved in the deployment and maintenance of the tachyon detection grid that ultimately decided the conflict.

In 1515 NE (2368), a quantum filament caused major damage to the Enterprise. Unable to communicate with the rest of the crew, O'Brien, together with Lieutenant Commander Deanna Troi, Ensign Ro Laren, and Ensign Mandel, was trapped on the bridge, while his heavily-pregnant wife Keiko was stuck in Ten Forward. The quantum resonance of the filament caused a polarity shift in the ship's antimattercontainment fields, leading to a progressive degeneration in the fields, threatening the ship. Ro suggested a saucer separation to save the primary hull, while sacrificing the stardrive section. O'Brien strongly opposed this plan and stated that it would be a "pretty cold-blooded thing to do." Eventually, thanks to his prowess in keeping the containment field stable long enough, Troi rejected Ro's proposal, and the antimatter containment was fully restored by Commander Riker and Lt. Commander Data shortly before Keiko delivered her baby in Ten Forward.

Later that year, O'Brien, along with Troi and Data, was taken over by an alien lifeform which forced them to take hostages to use as a bargaining chip in negotiating with Picard. Among the prisoners were Molly and Keiko O'Brien. Eventually, the lifeform left when it was discovered that the moon was actually a penal colony and that this was an attempt for the lifeform to escape

Deep Space 9[edit | edit source]

Services during the First Multiverse War[edit | edit source]

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