In the wake of Spock's ultimate act of sacrifice, the crew of the U.S.S. Enterprise returns to Earth from the newly formed Genesis planet. There crew learns that life back home will not be easier: Scotty gets reassigned, Bones appears to be going insane, and the Enterprise is to be decommissioned. It is only when Kirk is confronted by Spock2s father that he learns his old friend may have another chance at life if the crew can survive the Klingon interference...

Nero, a Romulan, appears from the future to carry out his revenge against the Federation, and rivals James Kirk and Ambassador Spock are forced to work together, along with the cadets of the newly commissioned USS "Enterprise," as they travel into the final frontier to save their civilization.