After chasing a Gorn ship into an uncharted sector of space, Kirk and the Gorn commander are transported to a desert planet, where they are forced to duel to the death.
Air Date: 01/19/67
Director: Joseph Pevney
Yet another classic episode - one that is perhaps the most recognizable Star Trek episode ever. If you get the chance, check out the episode of Hollywood Weapons where Terry Schappert tries to make the bamboo cannon. My take on that is "of course he can make gunpowder and a cannon out of a hunk of bamboo...he's the goddam captain!"