Treaty negotiations between the Hidran and Klingon Empire get off to a rocky start when a Hidran ambassador mysteriously dies. Worf is charged with the ambassador's assassination and Riker and Troi are trapped below the surface of the planet.
Voyager is ambushed and forcibly pressed into service as part of the Edesian Fleet in their war against the enemy Gimlon. Janeway has no choice but to join the campaign against the Gimlon, only to discover that the enemy has developed a new super-weapon capable of destroying entire worlds.
As an unknown force disrupts subspace throughout the galaxy the uneasy alliance between the Federation and the Romulans becomes strained while Picard and Spock join forces with a Romulan war criminal to find the source of the disruption.
Picard and his treacherous Romulan allies discover the source of the subspace crisis, a huge alien mechanism suspended between a black hole and a nearby inhabited planet. Picard finds himself confronted with a difficult choice of sacrificing a world and saving the rest of the universe.
The crew of the U.S.S. da Vinci find Beta Argola attacked by the same superior forces that are now overwhelming the da Vinci. Overmatched by three enemy vessels, the S.C.E. crew must use all of their wits to figure out how to take on a more powerful foe. And they have to do it soon, because the miners on Beta Argola are quickly running out of time before their reactor goes critical.