ENT Season 2 Episode 23 Regeneration

Plot

A team of researchers discover remains of a crashed spaceship in the Arctic Circle, finding two humanoids with cybernetic implants frozen in the wreckage. The bodies are taken to a nearby compound to be studied. The scientists marvel at the nanoprobes that begin to repair the long dead aliens. One of the seemingly dead subjects attacks the scientists, assimilating them. Using scavenged parts from the wreckage of the Borg ship to enhance the transport, they escape into space, upgrading it with a faster warp drive and weapons.
Admiral Forrest orders Enterprise to rescue the "kidnapped" researchers. They soon receive a distress call from a Tarkalean freighter, and they arrive to discover the ship under attack from the enhanced transport. Captain Jonathan Archer tries to disable their weapons, but the ship jumps to warp speed. Archer brings the survivors to Sickbay, and finds their situation reminiscent of a Zefram Cochrane story he remembers (relating to first contact). The assimilated crew soon awaken, and in the ensuing melee Doctor Phlox is infected with nanoprobes. They escape, and Lieutenant Reed then finds them modifying ship's systems, and learns that the enterprise's phase pistols are ineffective against them. Archer, left with no other options, orders the section to be de-pressurized. Reed then begins upgrading the pistols, while Phlox treats himself with "omicron radiation" to destroy the nanoprobes.
Enterprise again catches up with the transport, but the recent modifications suddenly activate and shut down weapons and propulsion. Soon after the aliens hail Enterprise and say, "You will be assimilated, resistance is futile". In response, Archer and Reed board the ship with upgraded pistols, plant explosives, and beam out. Commander Tucker troubleshoots the alien modifications thereby restoring main power to Enterprise. With the transport crippled, Archer realizes the altered crew members are too far gone and orders the transport's destruction. Later, a recovering Phlox informs Archer that while infected he kept hearing a repeating numerical sequence - Earth's coordinates sent somewhere into the Delta Quadrant. Sub-Commander T'Pol states it would take almost 200 years to reach its destination, but Archer remains troubled, fearing they only postponed the invasion.