Stardate 6334.1: Spock is infected with choriocytosis, a disease that is deadly to Vulcans. The only known cure is strobolin. The Enterprise is on a rendezvous course with the S.S. Huron to receive strobolin, but the cargo ship is intercepted by Orion pirates. The Enterprise pursues the Orions. In an asteroid field, the Orion captain sets up a trap to destroy the Enterprise along with the Orion vessel, as the incident would endanger his planet's neutrality. Kirk, however, can avert the detonation of the bomb and retrieve the strobolin.

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