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While negotiating a mining treaty on Capella IV, Kirk runs afoul of Klingon subterfuge and a rebellion among the planet's people that jeopardises the lives of the landing party.
The crew of the Enterprise contracts a strange disease that causes rapidly accelerated ageing---leaving the inexperienced Captain Stocker in charge. Then he blunders into a Romulan attack.
For the second time in his Starfleet career, Kirk encounters a cloud-like creature that drains humans of red blood cells, and decides this time to pursue and destroy the creature---no matter what the cost.
When a latter-day Jack the Ripper terrorises a crime-free planet, evidence points to chief engineer Scott, whose fingerprints are on the murder weapon.
Kirk, assigned to protect a grain shipment, finds that he has trouble with "tribbles": balls of purring fluff that live on grain and are incredibly prolific.
Kirk, Uhura and Chekov find themselves on the planet Triskelion, where they are trained to fight to the death for the amusement of the planet's rulers.
Castles, dungeons, witches, black cats and magic prevail as Kirk seeks a rational explanation of---and escape from---forces that lured him to an alien planet.