With one friend alive and one not, but both in pain, Kirk attempts to help his friends by stealing the Enterprise and defying Starfleet's Genesis quarantine. But the Klingons have also learned of Genesis and race to meet Kirk in a deadly rendezvous. Unexpected visit of Sarek, Spock’s father clarifies the situation and gives hope that Spock is still alive, but his mind was placed in McCoy’s body. In order to help his friends, Kirk hijacks the ship and violates the established by Federation quarantine on Genesis, where his son David is carrying out a scientific expedition. But at the same time, Klingons learn about the existence of Genesis and their warship, led by the ruthless Commander Kruge is approaching the Genesis planet. Their encounter is inevitable…