Battle of Sector 001 and the Journey to 2063

In 2373 a single Borg cube crossed Federation space and headed for Earth. Ordered to patrol the Romulan Neutral Zone because of his past assimilation, Captain Jean-Luc Picard disobeyed and brought the new USS Enterprise-E to Sector 001, where a Starfleet fleet was already being overwhelmed. Drawing on his lingering link to the Collective, he pinpointed a weak spot, and the cube was destroyed.

A smaller Borg sphere escaped and opened a temporal vortex to April 2063, the eve of Zefram Cochrane's first warp flight. The Enterprise followed it into the past, destroyed the sphere and set about repairing the damaged Phoenix, while Borg drones who had beamed aboard assimilated deck after deck. Picard confronted the Borg Queen, who tried to win Data over to the Collective.

Data turned against the Queen, Cochrane's flight took place as history required, and a Vulcan ship arrived to make first contact. The Enterprise returned to its own century with the timeline restored.