13 Darkest Star Trek: The Original Series Moments
3. Cheron's Destruction In Let That Be Your Last Battlefield
Bele had been chasing Lokai for years, a result of being on opposite sides of their planet's war. But when they finally return to Cheron, they find their people have destroyed themselves. They are the only two left, but this only fuels their hatred of each other all the more.
The war had lasted so long, no one really remembered why it started in the first place. But it ended in mutual destruction. Such a tragedy should have helped the two men reconcile their differences, but each blame's the other's side. They are determined to carry on the battle even though there is no reason left to fight.