Spock and McCoy have traveled through time, but have lost the portal they need for their return. Time is running out and Captain Kirk hurries to bring them back to safety. For Spock, this means saying a difficult goodbye.

A mysterious visitor, Seven, tries to convince Captain Kirk to let him disarm a nuclear missile/warhead that is heading for Earth. With Spock unable to do it himself, the crew is left with no choice but to trust him.

All good things must come to an end, and for the cast, this really is their final goodbye. In this video, you can see the read-through of the last script and final filming of their last episode together. There’s a genuine warmth between the actors, and some tears, but all are thankful for the good times, friendship, and camaraderie the show has given them through the years.

David and Ben Crystal explain why Shakespeare verses read with Original Pronunciation convey very different emotions and open up another level of understanding.