Stardate 3417.3: The Enterprise arrives at Omicron Ceti III, a planet whose colonists are believed to have died because of deadly Berthold radiation. But the group headed by a man named Sandoval is alive and in perfect health. Spock meets Leila Kalomi, who once fell in love with him although he couldn't return her feelings. She leads Spock to a plant that shoots spores at him, making him experience deep emotions but also lose his sense of duty. The spores are also the reason for the colonists' survival. Soon they keep spreading through the Enterprise's ventilation system, and all of the crew except for Kirk leave the ship to join the colony. Kirk asks Spock to beam up one last time. Insulting his first officer, he provokes such a strong rage in him that the spores lose their effect on Spock. The two modify the comm system to emit an infrasound that eventually accomplishes the same with the colonists and the crew by triggering quarrels among them. Sandoval now agrees with the relocation of his people.

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