Star Trek VI: The Undiscovered Country is a 1991 American science fiction film. It is the sixth feature film based on Star Trek, a sequel to 1989's Star Trek V: The Final Frontier and the last film featuring the entire cast of the original series. After the destruction of the moon Praxis leads the Klingon Empire to pursue peace with their long-time adversary the Federation, the crew of the USS Enterprise must race against unseen conspirators with a militaristic agenda. Wikipedia
(Dictating his personal log)
Captain James T. Kirk: Captain's log, stardate 9522.6: I've never trusted Klingons, and I never will. I could never forgive them for the death of my boy. It seems to me our mission to escort the Chancellor of the Klingon High Council to a peace summit is problematic at best. Spock says this could be an historic occasion, and I'd like to believe him, but how on earth can history get past people like me?