Albatross

When the Enterprise stops at Dramia to deliver medicine, McCoy is arrested for a plague that killed most of a colony nineteen years after he ran its inoculation program. Kirk tracks down a surviving witness to clear him, but the man falls sick on the return trip and the same symptoms sweep the crew, forcing Spock to break McCoy out of his cell so the doctor can prove the real cause is a spatial phenomenon, not his own negligence.