Star Trek: First Contact

Star Trek First Contact is a 1996 American science fiction film released by Paramount Pictures. It is the eighth feature film in the Star Trek film franchise, and the second film in the series to star the cast of the television series Star Trek The Next Generation. In the films plot, the crew of the USS EnterpriseE travel from the 24th to 21st century to save their future after the cybernetic Borg conquered Earth by changing the timeline.

Captain JeanLuc Picard wakes from a nightmare in which he relived his assimilation by the cybernetic Borg six years earlier shown in the television episode The Best of Both Worlds. Starfleet informs him of a new Borg attack against Earth, but orders the USS EnterpriseE to patrol the Romulan Neutral Zone so as not to introduce an unstable element to the fight. Learning that the fleet is losing the battle, the Enterprise crew disobeys orders and heads for Earth, where a single, damaged Borg Cube opposes a group of Starfleet vessels. The Enterprise arrives in time to save the crew of the USS Defiant which is being commanded by Lieutenant Commander Worf. After Picard hears Borg communications in his mind, he orders the fleet to concentrate its firepower on a seemingly nonvital section of the Borg ship. The Cube is destroyed after launching a smaller sphere ship towards the planet.The Borg sphere generates and enters a temporal vortex. As the Enterprise is enveloped in the vortex, the crew briefly glimpses an Earth populated entirely by Borg. Picard realizes that the Borg have used time travel to change history, and orders the Enterprise to follow. The Enterprise arrives in the past, on April 4, 2063, the day before humanitys first encounter with alien life after Zefram Cochranes historic warp flight. The Borg sphere fires on the planet the Enterprise crew then destroy the sphere and, realizing that the Borg were trying to prevent first contact, send an away team to the Montana missile complex where Cochrane is building his ship, the Phoenix, to look for survivors. Picard sends Cochranes assistant Lily Sloane to the Enterprise for medical attention, then returns to the ship and leaves Commander William Riker on Earth to make sure the Phoenix s flight proceeds as planned. The Enterprise crew sees Cochrane as a legend, but the real man is reluctant to assume his historical role. ........

Source: Wikipedia