The unnamed Klingon officer in charge of the dilithium mines of Rura Penthe in Star Trek VI, who welcomes Kirk and McCoy to the prison and later tries to have them killed.
The commandant runs the penal colony on the frozen asteroid Rura Penthe in Star Trek VI: The Undiscovered Country. He greets each batch of new prisoners, Kirk and McCoy among them, with a speech pointing out that the prison needs no walls or towers, only a magnetic shield that blocks transporters; anyone who leaves it freezes to death on the surface.
He is in fact part of the plot to dispose of the two officers. The shapeshifter Martia lures them beyond the shield so that they can be shot while escaping, and the commandant arrives with his guards, has Martia killed and is about to name who wanted Kirk dead when the Enterprise beams the pair away.
He was played by W. Morgan Sheppard.