Kirk, Spock, McCoy and a doomed red-shirt beam down to investigate a Prime Directive issue when they believe Captain Tracey (Morgan Woodward) has used his phaser to help a group of people called the "Kohms" in their slaughter of the barbaric "Yangs."
Potentially interesting, "The Omega Glory" quickly degenerates into wretched excess, the first of many problems being the extreme to which the insane Tracey takes his treachery against Kirk, even when the rationale for it disappears. This episode is one of the most colossally huge messes I've ever seen on Trek. This is a plot that prompts one to start scanning the screen for the kitchen sink, and specializes in out-and-out incoherence. The attempt to politicize the material proves inept—the Yangs (Yankees) versus the Kohms (Communists) requires a leap of credulous faith I'm not willing to take. The "parallel Earth" arguments are dubious, to say the least, but when it goes so far as to use the American flag and the Constitution as symbols of an alien ideology gone wrong, it becomes preposterously overly patriotic—especially through Kirk's final speech.
All meaning is lost in a sea of seemingly random ideas posing as allegory, none of which is slightly believable on one very important level—the story's surface. Gene Roddenberry may be known for many things, but one would hope he's not known for writing "The Omega Glory."