Stardate 5275.6: The USS Enterprise delivers medical supplies to Dramia when Dr. McCoy is arrested for mass slaughter and imprisoned. Nineteen years prior, Bones had created an inoculation program for a Saurian virus on Dramia II, but immediately following his departure a plague wiped out most of the population. A survivor named Kol-Tai is going to testify for McCoy, but the whole ship is infected when it crosses an aurora. Spock frees the doctor from the prison who then discovers that an aurora was the reason for the first plague too and that Kol-Tai was immune because he had been treated with Saurian antibodies. With this knowledge, McCoy succeeds in developing a cure for the plague.

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