Stardate 3211.7: When they are just going to beam down to the planetoid Gamma II, Kirk, Uhura and Chekov suddenly vanish from the transporter platform. They find themselves as prisoners on the planet Triskelion. In the meantime, Spock has decided to follow an ion trail in order to retrieve the three officers, against the advice of McCoy and Scott. Kirk, Uhura and Chekov are supposed to fight against gladiators for the entertainment of the planet's rules, who place bets on their thralls. When the Enterprise arrives at Triskelion, the Providers disable the ship. Kirk, however, challenges the Providers, who are actually three brains that claim to be superior to humanoid beings. Winning a fight against three other thralls, Kirk regains the freedom of his crew and of all other slaves.

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