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...