This page contains information regarding Star Trek: Lower Decks, and thus may contain spoilers.
Both of her parents served in positions of command in Starfleet: her mother (and later captain), Carol Freeman, attempted to keep a close eye on her activities aboard the USS Cerritos, while her father was a Starfleet admiral.
- 1 Childhood
- 2 Starfleet career
- 3 Personal interests
- 4 Personal relationships
- 5 Appendices
Mariner prided her ability to think for herself in critical situations, as she had served aboard five different Starfleet vessels, including the USS Quito, and had "seen stuff". There was a time when she was interested in advancing in rank, though her views regarding promotion and the importance of the senior staff had become somewhat jaded by 2380. (LD: "Second Contact", "Cupid's Errant Arrow")
On one harrowing occasion, she was trapped in a sentient cave for weeks, describing it as "a dark place that knows things." She also noted that she had almost been decapitated by a singing crystal, and held in a Klingon prison where she had to fight a yeti for her shoes merely because the yeti wanted to be antagonistic. (LD: "Envoys")
She kept additional battle scars from a fight with a tentacled man that stabbed her with a barnacle blade in the chest, a fight on Magus III that left a scar on her right shoulder, a scar on her left bicep from Nanibia Prime, and a scar on her hip from a fight in Scottsdale. (LD: "Temporal Edict")
At some point, she befriended and blood bonded with General K'orin. The two had worked together on Jaxxa Prime, Vulcan, and Earth. Years later, she recalled that she and K'orin had done some "off-the-books grey-ops stuff back in the day." (LD: "Envoys")
Mariner excelled at Starfleet Academy, getting the best grades in her class. She was often noted as being a bit of a role model for her class, and that she always made sure her class kept up with her. Many, such as her friend and classmate Amina Ramsey predicted that Mariner would be the first of her class to get promoted to captain. (LD: "Much Ado About Boimler")
Deep Space 9
Sometime between 2372 and 2375 Mariner started serving aboard Deep Space 9. During this time, she once broke Worf's mek'leth, and, apparently, had it mended before he noticed it was gone. (LD: "We'll Always Have Tom Paris")
Also sometime during the 2370s, Mariner served aboard the starship Atlantis, when nearly half of the ship's crew succumbed to a Kerplickian lice infestation. Since Starfleet was embarrassed by the situation, it was never logged in official records. Mariner took advantage of that fact when she started a rumor that she was a specially trained black ops spy who had killed those who had otherwise simply and officially had mysteriously disappeared.
In 2381, Honus, a Cerritos bartender, shared these rumors about what happened aboard the Atlantis with Ensigns Brad Boimler and Sam Rutherford which caused them to briefly second guess their relationship with Mariner. (LD: "Mugato, Gumato")
While aboard the Quito, she participated in establishing first contact with the Galardonian High Council in 2379. Sometime in the 2370s she experienced her good friend and crew mate, Angie, get eaten alive by a Harvongian shape-changer while their ship was docked at Deep Space 9. The experience was traumatic, causing her to be on high alert in 2380 when she thought something similar could be happening to her friend Bradward Boimler. During her time aboard the Quito, she spent time in the brig on many occasions and was eventually demoted to ensign and transferred to the Cerritos by her father, under the command of her mother, Captain Carol Freeman. (LD: "Second Contact", "Cupid's Errant Arrow")
The Cerritos was Mariner's fifth ship posting. Her fellow command division officer and eventual friend Brad Boimler noted that she hated to give the orientation liaison tour, but offered to provide a tour to Ensign D'Vana Tendi to get her to help moving shore leave contraband. By this time, she had been serving on the Cerritos for a year.
In 2380, while supporting second contact efforts with the Galardonians, Captain Freeman asked Ensign Boimler to monitor Mariner's activities. He eventually believed he had caught her selling Federation weapons, but she had actually been providing needed farming equipment to local farmers in an effort to bypass Starfleet bureaucracy. (LD: "Second Contact")
Aboard the Cerritos, Mariner's assigned bunk was A12001, in the residential hallway used for lower deck officers on beta shift. (LD: "Envoys", "Terminal Provocations") For a brief time, she received another promotion to lieutenant and, as such, received her own quarters, before being demoted back to ensign. Her promotion was actually a scheme to get her to resign to another ship after she disrespected Captain Freeman in front of Captain Durango. (LD: "Moist Vessel")
Mariner was highly proficient at hand-to-hand combat, and was a master of anbo-jyutsu. She was well-practiced at martial arts because it could be done alone and she often lacked friends at her postings.
Both Mariner and her mother attempted to conceal their familial relationship from the general public, though Brad Boimler became aware of it by accident, and later revealed it to the crew on an open communications channel. (LD: "Crisis Point", "No Small Parts")
Mariner considered Boimler her best friend, and the two often worked together on missions. Though their friendship started a bit rough, and though their personalities and approach to their missions could be drastically different, with Boimler being more by the book, while Mariner would act more on instinct, they worked well together, and developed enormous amounts of respect for one another. As a show of friendship, Mariner decided to become Boimler's mentor with the intention of getting him into a captain's chair. She also helped restore some faith in himself as a Starfleet officer by deliberately making herself look bad when he got close to quitting Starfleet. (LD: "Second Contact", "Envoys", "Strange Energies")
When Boimler accepted a promotion, and transfer to the USS Titan, Mariner was very angry and hurt that he didn't say goodbye, and held a grudge against him for a brief period of time. While she missed him, she did eventually understand his decision, and was happy for him. Boimler's time on the Titan was limited, however, and when he returned to the Cerritos, Mariner was very excited to see him return, and welcomed him back instantly (though she wasn't above giving him a little flack for leaving). While she welcomed him back, she did hold a small bit of anger at him, which was revealed during a visit with Boimler to Starbase 25. While Mariner was angry with him for never apologizing, Boimler was angry that she was being selfish, and that he earned his promotion to the Titan. The two eventually reconciled, with Boimler giving her the apology she had been waiting for. (LD: "No Small Parts", "Strange Energies", "Kayshon, His Eyes Open", "An Embarrassment Of Dooplers")
Despite the arguments Mariner and Boimler could often find themselves in, the two were practically inseparable to the point where Tendi assumed them to be dating. They affectionately teased one another, and Mariner considered Boimler her "number one". (LD: "We'll Always Have Tom Paris", "An Embarrassment Of Dooplers")
Mariner and Tendi were friends, but did not have a very close relationship for a while. Since Tendi was closer with Rutherford more often than not, for the first year that Tendi served aboard the Cerritos, Mariner was completely unaware of Tendi's first name. Tendi was also unaware of a lot of Mariner's service history with Starfleet. Mariner also had a habit of associating Tendi with common stereotypes associated with Orions, much to the discomfort and frustration of Tendi, who was trying to distance herself from such stigmas. (LD: "Crisis Point", "We'll Always Have Tom Paris")
Despite this, the two did grow closer as friends as time went on to the point where in a single mission, Tendi disclosed more information about herself than even Rutherford knew. Mariner saw Tendi as a very kind and good person, and was willing to take the blame for her when she'd get into trouble.
William T. Riker
Aboard the Cerritos, Mariner went on one date with Lieutenant Steve Levy in 2379, but ended it because he believed conspiracy theories, such as that "Wolf 359 was an inside job." (LD: "No Small Parts")
- LD: Every episode
Mariner was voiced by Tawny Newsome.
In developing the characters for Lower Decks, Mike McMahan described all four leads in an 10 August 2020 TrekMovie.com interview as a combination of other Star Trek characters, parts of himself, and people in his life. Mariner had elements of Captain James T. Kirk, Kathryn Janeway, and Jean-Luc Picard, "she knows the rules, but also sometimes feels like she should bend them because she knows better." He further compares her to "Maverick in Top Gun... he's great at flying a jet, but he also buzzes the tower." 
McMahan named Mariner after his sister, Beckett Mariner McMahan, and based her relationship with Captain Freeman on his sister's relationship with their mother "when my sister was younger and would throw down with my mom occasionally."  
No explanation is given for Mariner having a different surname than both of her parents.
Beckett Mariner appears as a duty officer in Star Trek Online.