It's been more than a year since I featured an episode of Star Trek ("Transfigurations: Next Generation") so I figure I can afford to indulge in another episode :)
This time, it's from the original crew themselves in "Errand of Mercy", which is definitely one of my all-time favourite Star Trek episodes. If you haven't watched this before, the plot is basically about Starfleet's attempts to prevent a planet from being taken over and used as a base by the Klingons.
The planet, Organia, is home to seemingly primitive and simple-minded people, who infuriate Kirk when they appear to do nothing to defend themselves from impending attack. Even when Klingons beam down onto the surface and start killing the inhabitants in cold-blood, the leaders still refuse to fight to defend themselves. Soon, the Klingons take control of the planet.
So it's up to Kirk and Spock to lead the defense and repel the attacking Klingons, backed up by the Enterprise (orbiting above Organia) and her technology. All out war is imminent.
But....just when they start to attack each other, their weaponry get red-hot, as if on fire. Even the controls on Enterprise and the Klingon war-bird become hot. No one could use any weapons!
Kirk, Spock and the Klingons are left bewildered and shocked. The leaders of Organia then explain to them that violence cannot be allowed on their planet, and asks that the "visitors". The leaders then transform into blinding Light Orbs and disappear.
That is the gist of the episode. Lots to think about, yes?
Here's a short clip of the episode. I'm sure you can find the full episode somewhere in Cyberspace....Please be warned that this episode aired in 1967, so if you are expecting lots of action and special effects, better to give it a miss. Even the Klingons had minimal make-up!