Spock’s dad is back, and he is on board for one last diplomatic mission before he retires to Vulcan. He is over 200 years old after all.

Mark Lenard was the first Romulan on screen, a Klingon commander, and the father of Spock in both TOS and TNG. He mind is failing him and the crew of the Enterprise must face the consequences.

I summarize the plot and point out and explain all the references so you don’t have to