- The Enterprise reaches a Federation colony where the adults have all killed themselves but the children play without care.
- The Enterprise responds to a distress call from the scientific colony on Triacus and arrives to find that all of the adults are dead. Oddly, the children seem unaffected by the deaths and continue to play as if nothing had happened. When questioned, they show no remorse whatsoever and express a dislike for parental authority. Expedition logs reveal that the expedition had discovered an ancient civilization and that there might be one survivor. In fact, the Gorgon thrives on the innocence of the children and the adults' self-doubt.—garykmcd
- The Enterprise reaches the Federation colony on the planet Triacus where the adults have committed collective suicide, leaving a recording about an 'enemy from within'. Yet their orphaned children play seemingly without care or grief, or rather block out the thought of their parents, which they say were always too busy to care for them. In their quarters aboard the Enterprise, the kids conjure a creature they call the Angel which orders them to see the ship goes to the populous planet Marcus 12, and thereto control the starship's crew. Spock finds a scientist's unscientific hypotheses about extreme anxiety striking only the adults and records of an archaeological excavation of the extinct native civilization, which seemingly had one survivor. The children's leader Tommy Starnes disturbs these images, then works his irresistible power of suggestion on the bridge crew, the others on other crew; by the time Kirk and Spock are on to them the Angel is conjured again.—KGF Vissers
- The Enterprise reaches the Federation colony on the planet Triacus where the adults have committed collective suicide, leaving a recording about an 'enemy from within'. Yet their orphaned children play seemingly without care or grief, or rather block out the thought of their parents, which they say were always too busy to care for them. Spock theorizes that it could have been a chemically induced mental depression, which led to mass suicide. As they enter a cave to investigate, Kirk feels very anxious and runs out.
In their quarters aboard the Enterprise, the kids conjure a creature they call the Angel (Melvin Belli) which orders them to see the ship goes to the populous planet Markos 12, and thereto control the star-ship's crew. The Angel says once they get to Markos 12, they will have a million more join them, which will allow him to rule the universe and the kids will have a huge playground to play in..
Spock finds a scientist's unscientific hypotheses about extreme anxiety striking only the adults and records of an archaeological excavation of the extinct native civilization, which seemingly had one survivor. The children's leader Tommy Starnes (Craig Huxley) disturbs these images, then works his irresistible power of suggestion on the bridge crew, the others on other crew; He forces Kirk to divert the Enterprise to Markos112 as he has relatives there. Kirk would not agree to the suggestion, so Tommy hypnotizes the crew to think they are in orbit around Triacus, while actually they are on their way to Markos XII.
Kirk and Spock finally are able to finish the tape in McCoy's cabin. Spock says that the natives of Triacus were marauders who were eventually destroyed themselves. Kirk also learns the prof Starnes had requested a ship on Triacus, but later canceled that request when he was convinced of the "enemy within". As Kirk prepares to beam down to the Triacus, he realizes that the ship is no longer around Triacus and is on its way to Markos XII. But his crew is convinced that they are are still in orbit around the planet.
Kirk gets to the bridge to see that the entire crew is under hypnotic control of the kids, and they are in turn controlled by the Angel. Any order Kirk gives, is not followed by the crew, including by Spock. But Kirk and Spock are able to resist the hypnotic commands of Tommy. TOmmy tries to influence Sulu and Chekov to put Kirk under arrest. Kirk and Spock overcome Chekov and Sulu and discuss that the kids are overcome by alien forces and might need to be killed. Kirk realizes that the kids are followers of the evil force as they think it is their friend. Kirk forces Tommy to summon the Angel again. he shows Tommy and the kids pictures of how happy the kids were with their parents on Triacus. The Angel only made them orphans and is using them for his personal benefit. As the kids are convinced, the Angel's power weakens and gradually, he is destroyed. The kids are back to normal and Kirk sets a course for Starbase IV.
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