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.