Can anyone remember when we used to be explorers? - Jean Luc Picard
15 years have past since the first Dominion War. Voyager has since returned home, and the Borg threat seems to have been eliminated. The Romulan people have firm control of their government once again. The Reman population has been emancipated, and are now enjoying privileges as full citizens of the Romulan empire. The lessons of Shinzon have been learned.
The Federation for the first time in decades enjoyed peace. Still rebuilding, and wary from previous conflicts Starfleet remains vigilant. Especially with new turns of events.
Chanceller Martok of the Klingon Empire has "disappeared" No one knows the fate of the empires benevolent Chancellor. Many believe he was murdered, A successor named Kodan has stepped up to take his place. He is as xenophobic as he is bloodthirsty. He calls himself the new "Emperor". Dismissing Khaless as a fraud. Kodan has a following of many "Glory seekers" that practice ways from the old times. He rules with an "iron fist" compared to previous Klingon rulers. Kodan reminds some within the empire of the Tyrant Molar. Some within the empire call Kodan the "Usurper", but wont say so out loud, because those that do wont live very long afterwards. They await one with the courage, and honor of Khaless to challenge him. Relations with the Federation are not too cozy right now.
The Romulan Empire reverted back to its old ways of isolationism, and subterfuge. Though the Romulan Empire retained some "good" relations with the Federation since the events of Shinzon. Trade, and commerce have thrived since, and there was a time where it was thought that the neutral zone would become a thing of the past. However that has changed. There are those who still support the old imperial "manifest destiny". Where they think only the Rihansu are worthy enough to rule the galaxy, and all non-Rihansu are nothing more than subject races beneath them to be exploited.
The Dominion have maintained peaceful if cool relations with the other factions since the first war. They still remain bitter at their defeat, and surrender. Animosity runs rampant within the Founders despite Odos re-assurances that the "Solids" can be trusted. Odo realized that the Founders truly did not want peace, and the surrender was to buy time to rebuild their forces, and plan a strategy for a new invasion. All of the peaceful overtures made by the Dominion were a ruse to provide a false sense of security. Odo now part of the great link could do nothing. He was effectively silenced as was part of the founders plan.
With the help of their old Breen allies the Dominion broke the peace treaty of 2373, and stormed through the wormhole with a vengeance. Reconquering Cardassia, and Bajor. They launched a three pronged assault on the three major Alpha Quadrant powers. Just as before the founders are intent on total domination of "the solids". This time there may be no stopping them.
The Breen went out of their way to re-join their old allies, and spearheaded the initial assault with hundreds of cruisers warping in just as the Dominion main assault fleets exited the wormhole. Deep Space Nine despite her powerful upgrades, and garrison fleet was destroyed in minutes. The wormhole is now under total Dominion control. With endless re-enforcements pouring through. Cardassia, and Bajor are now enslaved worlds. The Cardassians that survived the new invasion are now used by the Dominion as "battle thralls" as punishment for their past betrayal. It is a slow death sentence imposed by the Founders. Cardassian ships are forced to spearhead suicide missions, or provide a shield wall for the Jem Hadar, and Breen. All Cardassian ships in Dominion fleets seek to mutiny, and break away from their masters. They seek refuge in ether Federation, or the Klingon space.
Meanwhile.... As four major empires are fighting for survival, control, or domination.. Transwarp signatures are detected. The Borg have returned. The transwarp network was not destroyed as previously thought. Only damaged. The Borg Collective views the Alpha Quadrant species the most serious threat to their existance. Especially species 5618 (Humans). They attack not with just a few ships, but with the force of the entire collective. Worlds fall in minutes. Then all are exterminated. Assimilation is irrelivent. All must be annihilated if the collective is to survive.... Resistance is futile.
Know that it is the year 2388,
and the Known galaxy is now in a state of Total War...