The Cardassians proceed to destroy the Federation's reserve fleet. Meanwhile, the Cardassians use the sudden absence of Federation forces to begin their own offensive. Though successful, some of the Federation forces, Picard included, are left stranded when the Transwarp Portal collapses due to a destabilization of the inter-spatial transwarp manifolds. Starfleet Command then orders Picard to seize control of it and launch a counteroffensive into the heart of Borg space in the Delta Quadrant, into the Borg staging grounds. Intrigued, Picard discovers a new type of transwarp gate called a Transwarp Portal, capable of sending fleets of starships from one quadrant to another almost instantly, explaining how the Borg managed to get so deep into the Alpha Quadrant undetected. After routing the attempted foothold, Captain Picard discovers a new type of nebula: a tachyon nebula. They have created a new ship capable of assimilating entire worlds in just a few seconds.

Set just six months after the events of Star Trek: Armada, the Borg once again threaten the Alpha Quadrant. ( February 2015) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.