 When Kirk, Chekov and Uhura are in the transporter room, a unknown force diverts them immensely to the planet Triskellion, where they find their phasers disabled and are declared lifelong thralls (slaves) to be trained, among members of various planet races, as gladiators controlled by a paralyzing pain-inducing collar of obedience operated by Master in the service of three  providers , who own the  herds  in the games they hold wagering for their amusement. Meanwhile acting commander Spock has a hard time tracking them over the enormous distance. The earthlings not only impress but also arouse feelings and thoughts in their fellow gladiators, who were to train them. Kirk gets to see and talk with the three providers...