After a visit from Stargazer captain Jean-Luc Picard, whom he had seen in a hallucinatory vision prior to the meeting, Calhoun left his homeworld and joined Starfleet.
After a falling-out after the events surrounding the death of his captain on the USS Grissom, Calhoun left Starfleet, but was lured back by Picard and took command of the Excalibur.
Peter David has stated that the character of Commander Quentin Stone from his 1991 TNG novel, A Rock and a Hard Place, unintentionally turned out to be an early draft of Calhoun.
Originally, s/he served the chief engineer of the Excalibur under Captains Korsmo and Calhoun, but has since received a promotion, and now holds the position of first officer on the current ship bearing that name.
Seeking to make amends, Selar decides to remove Burgoyne's "hurt" by using a mind meld to erase all hir memories of their relationship.
Doctor T'Para Lotos Selar, a female Vulcan, originally appeared in the TNG episode "The Schizoid Man" as a lieutenant and medical officer under Dr. Pulaski.
It is revealed in the opening New Frontier novel story arc that her husband, Voltak, suffered a fatal heart attack years earlier when they were consummating their marriage during pon farr.
In the 2009 novel Treason, Selar, desperate for a cure for the rapid aging that afflicted Xyon, was telepathically manipulated by a race called the D'myurj into kidnapping Cwansi, the infant son of Robin Lefler and Si Cwan.
[2] Robin Lefler served for a time on the USS Enterprise-D (where she appeared in the TNG episodes "Darmok" and "The Game", played by Ashley Judd).
Originally the security officer, the metamorphosed Kebron (whose personality has become far more open, caring and verbose since his transformation) now serves double-duty as counselor on the current Excalibur.
It was later discovered that these abilities were due to his parentage: his great-grandparents were Starfleet Lieutenant Carolyn Palamas and the Greek god Apollo, both of whom appeared in the Star Trek: The Original Series episode "Who Mourns for Adonais?".
However, after the Romulan emperor was assassinated during a coup (depicted in the film Star Trek Nemesis), Soleta undertook freelance espionage engagements in support of the Thallonians or Mackenzie Calhoun.
Admiral Edward Jellico originally appeared in the TNG episodes "Chain of Command Parts 1 and 2" (as played by Ronny Cox), at which time he held the rank of Captain.
Although Janos served for a time as a security officer on the Excalibur, he eventually devolved to a more bestial form, and was last seen residing on Neural (see "A Private Little War"), the world where he was originally created, no longer as an active member of Starfleet.
M'Ress (also portrayed in the animated Star Trek, where she was voiced by Majel Barrett) served with Arex on the USS Enterprise as a communications officer.
M'Ress had some difficulty adapting to her new time period, which was not helped when she was mind-raped by another member of the crew, but eventually became chief science officer on the Trident.
She bears a resemblance to Number One, Nurse Christine Chapel, Lwaxana Troi and the voice of Federation computers (all played by Majel Barrett).
Her seemingly immortal body was destroyed during an attack by the Greek gods, but her mind was integrated into the Excalibur computer, where it remained for some time and grew in power.