"And a Child Shall Lead Them"
A search for black marketeers of tri-faxichologenic acid (TFA) leads the Enterprise to an unexplored sector of the Organian treaty zone, where it discovers an uncharted asteroid. Captain Kirk, Mr. Spock and Dr. McCoy beam down to the surface to investigate. They find no traces of civilization, however Mr. Spock reports scattered life-form readings, and massive concentrations of TFA. "Jim, do you realize what this means to medical science?" McCoy asks. "Many researchers consider TFA a universal antibiotic, able to cure any disease!" "Easy Bones, first things first!" replies the Captain. "Our primary mission is to track down the black marketeers! I'd say it's a good bet they're located somewhere on this world!"
A short while later, the landing party discovers a large mining operation. Native men and women are hauling tri-faxichologenic acid crystals from the mine, while another group of men wearing red uniforms oversee them. The uniformed men are distributing Kurali juice to the natives as a "reward" for their work. "They're turning those poor people into addicts!" says McCoy, "We can't let this go on, Jim!" The landing party approaches the camp, and Kirk confronts the leader of the uniformed men. "I'm Captain James Kirk of the starship Enterprise!" Kirk says. "You're all under arrest!"
The leader introduces himself as Pete Flamm. "I'm in charge of this operation" he says, "and I say there's no law against mining TFA!" "Maybe," the Captain replies, "but it is illegal to distribute Kurali!" Kirk orders Flamm to shut down his operation immediately. Flamm refuses, and threatens to run the crew men over with his large mining machines unless they leave. "Have it your way, Flamm" Kirk says, and calls the waiting shuttle craft to execute "plan omega." The shuttle 'Leonardo' soon arrives, and begins destroying Flamm's mining equipment with phaser blasts. As the Leonardo prepares to land, a boulder hits it, causing it to crash. Kirk, Spock and McCoy look to the top of a nearby cliff, and discover that a young boy threw the boulder! The boy swiftly attacks the security guards coming out of the wreck of the Leonardo, throwing punches wildly. "Nice work, kid" says Flamm, "keep them busy 'till we're far away!"
McCoy tells Kirk that he would like to take Klwama back to the Enterprise, in order to do a brain-scan on him, and possibly learn his identity. Klwama agrees, provided that Kirk does not pursue the fleeing miners. Kirk agrees, but only until negotiations are completed. The landing party beams back up to the ship with Klwama. A security detachment is left behind to prevent the miners from leaving the planet, however they do not chase after them.
Back on the ship, the Doctor's tests indicate that Klwama has super-genius thought processes, and that his body can withstand heat up to +312, and cold down to -190. McCoy also learns that TFA is a vital nutrient to the natives of the asteroid, and that they cannot live without it. Meanwhile, Spock searches the ship's computer for information on the boy. "Subject Klwama" recites the computer, "subject bears a strong resemblance to husband and wife explorer team that vanished when subject was an infant."
When they arrive on the planet, Flamm, along with many of the natives, surround them and threaten them with weapons. "It appears your people no longer trust you, Klwama" Spock says. Flamm tells the party that his men had overcome the squad of security guards, and tied them up. Since the natives had feared losing the Kurali drug, they had joined in as well. "How far do you think this will get you, Flamm?" Kirk asks. "Far enough, Kirk" says Flamm. "All I need is time to get off this asteroid and find a safe place to hide!" Secretly, Kirk opens his communicator so that the Enterprise can hear the conversation.
Scotty immediately dispatches a large combat team, which beams down and surrounds Flamm and his men. "You're outnumbered" Kirk says, "there's no possible escape. Don't waste lives needlessly!" Flamm and his men knock out the natives alongside them, and then aim their weapons at the landing party and the Enterprise guards. "Play time's over, Kirk!", says Flamm, "tell your men to drop their pieces or we start shooting!"
Klwama sneaks up behind Flamm, and grabs his head in a lock. "Tell your friends to drop their weapons," he says, "unless you wish to have your neck snapped!" Flamm orders his men to surrender, and Klwama is once again a hero to his people. Dr. McCoy produces enough antidote to cure all the natives of their addictions. "We will recommend to our superiors that you remain here as leader" Kirk says, "and as a contact with the Federation." "I am honored!" replies Klwama.