For those not too familiar with the Pockets Books DS9-relaunch novels and other media, here is a listing of pivotal events alluded to in “Omega” that provide a backstory for various characters.
Following the end of the Dominion War, Martok’s position as chancellor is threatened. In the ensuing coup d’etat, the Imperial Hall is destroyed claiming the lives of many on the Council. The coup fails, but comes at the cost of Martok’s wife and his four children.
During an attack on Deep Space Nine by renegade Jem’Hadar, Commander Tiris Jast is killed on the bridge of the Defiant. Lieutenant Ezri Dax assumes command, drawing on the knowledge and experience of previous hosts. Afterwards, she transfers from the medical to the command division. This major life change is among the factors leading to difficulties in her relationship with Julian Bashir.
Ro Laren, having returned to Bajor after two years operating behind the lines during the Dominion War, is named Deep Space Nine’s chief of security with a Bajoran Militia commission of lieutenant.
Commander Elias Vaughn of Starfleet Special Ops accompanies the Enterprise-E as it is patrolling the Badlands when the ship discovers a derelict Cardassian freighter. An away team discovers the missing Orb of Memory. Vaughn, having contemplated retirement at 101 years of age, finds a new purpose in life. He requests and receives a posting as Deep Space Nine’s executive officer and commander of the USS Defiant.
Julian Bashir is recruited by Section 31 agent Cole to confront Ethan Loecken, a human augment who had recently broken away from the bureau and now leads a legion of Jem’Hadar loyal to him. Ezri Dax, Ro Laren, and First Taran’atar accompany Bashir to Sindorin to derail Loecken’s plans. The mission is a success, but Bashir is unable to accumulate any evidence that might expose 31. Upon his return to the station, Bashir learns that Vaughn has been tracking the activities of Section 31 for at least the last year (referencing the events of Star Trek: Insurrection)
In this four-part comic book mini-series, Verad Kalon leads a terrorist crusade against what is perceived to be the oppression by joined Trills of the non-joined majority. With the help of the Defiant and the Enterprise-E, Julian Bashir and Ezri Dax are able to combat a virus being unleashed against Trill symbionts. Verad takes his own life to avoid being captured by the authorities.
Mission Gamma tetralogy
The USS Defiant embarks on an historic three-month journey of exploration in Gamma Quadrant.
During this long-term mission, Elias Vaughn encounters his ex-wife, Ruriko Tenmei having been assimilated by the Borg. He is forced to kill her to save their daughter and Defiant flight controller, Prynn Tenmei. Ruriko's disappearance during a mission authorized by Vaughn and Starfleet Special Ops led to a gulf between father and daughter. Elias and Prynn were attempting to reconcile, but this incident puts even more strain on their relationship.
Benjamin Sisko returns from the timeless realm of the Celestial Temple in time for the birth of his daughter, named Rebecca Jae after Benjamin’s stepmother and Kasidy’s mother.
Bajor is admitted into the United Federation of Planets. Kira Nerys and Ro Laren are among Bajoran Militia personnel granted Starfleet commissions. Kira offers command back to Sisko, but he refuses. Instead, he goes on an extended leave of absence to be with his family in his new house on Bajor.
Quark, fearing that his business won’t fair as well under the Federation economy, had considered leaving the station and returning to Ferenginar. Instead, he elects to stay, becoming the Ferengi ambassador to Bajor and his establishment on Deep Space Nine becomes the Ferengi embassy. In effect, Quark’s Bar, Restaurant and Casino becomes sovereign Ferengi territory.
After they confront a crisis on Trillius Prime, Julian Bashir and Ezri Dax dissolve their romance.
Other Pockets Books novels:
General Hiren (Romulan praetor at the beginning of Star Trek: Nemesis) arranges the assassination of Praetor Neral by sending poisonous birds to Neral’s home. Hiren is then anointed the new praetor.
Establishes that the central character of this series, Ael t'Rllaillieu is relative of Liviana Charvanek, the Romulan commander in “The Enterprise Incident”. Donatra’s relationship to both of them is established in "Omega".
The non-aligned world of Tezwa seemingly declares war on the Klingon Empire through the use of nadion pulse cannons. The Enterprise-E is dispatched to defuse hostilities. Away teams from the Enterprise discover the cannons to be of Federation origin. UFP President Min Zife placed those weapons there, in violation of the Khitomer Accords, as part of a fallback strategy in the Dominion War. Now, Prime Minister Kinchawn has gone mad and is using the nadion cannons to advance his ambitions. Should the Klingon High Council learn of this illegal weapons deal, war would break out between the Empire and the Federation and leave the two powers highly vulnerable to the Romulan Star Empire and the Tholian Assembly.
A coup d’etat ousts Kinchawn from power while Starfleet flag officers pressure Zife to quietly resign. To prevent any further political fallout, Section 31 arranges the assassinations of Zife, his chief of staff Koll Azernal, and other members of the administration.