Stardate 5029.5: All scientists of the outpost on the planet Triacus have apparently committed suicide, but their children do not seem to be troubled about it at all. They are under the influence of the "Friendly Angel" Gorgan, a non-corporeal being from Triacus that is actually responsible for the deaths. The children help Gorgan induce hallucinations in the crew to take the ship to Marcus XII, where he hopes to find more victims. Two crewmen die as they are beamed into space because unbeknownst to the crew the ship is no longer in orbit of Triacus. But Kirk and Spock finally convince the children to turn against Gorgan, showing them what he has done to their parents.

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