The Klingons have been featured one way or another in every Star Trek movie produced to date — whether as actual characters or as starships on a monitor — but there is only one film in which the Klingons truly took centre stage. And that film happens to be one of the few Star Trek movies that was not scored by Jerry Goldsmith or James Horner, the subjects of the first two parts of this series.
The film in question is Star Trek VI: The Undiscovered Country (1991), which served as a bridge of sorts between the original Star Trek TV series (1966-1969) and its follow-up, Star Trek: The Next Generation (1987-1994). The latter series had shown that the Federation and the Klingons would one day get along, more or less, so this film — the last one to feature the entire cast of the original series, and the first one to feature an actor from the later series (though not any of its characters) — aimed to show exactly how the Cold War between these two powers had ended.
And one of the striking features about the soundtrack for this film, composed by Cliff Eidelman, is how up-front it is about its Klingon elements — to the point where it is the only film in the entire series that does not begin with one of the standard Star Trek themes but, instead, begins with a theme that was written for the Klingons.