When the pilot emerges and subsequently collapses, he displays a unique appearance; black on the left side of his face and white on the other. Brought to sickbay, the pilot is revived by Dr. McCoy and identifies himself as Lokai from the planet Cheron. Although grateful for the rescue, he is combative when questioned about the theft of the shuttlecraft. Concluding that Lokai's coloration is a mutation of some kind, Kirk plans to return Lokai to Starbase 4 to face theft charges once the Arrianus mission is completed.
En route, however, sensors pick up a highly sophisticated (and invisible) vessel on an apparent collision course with the Enterprise. At the last moment before impact, the ship appears to disintegrate, but deposits its pilot on the bridge; Commissioner Bele – similar in appearance to Lokai, but the colors are reversed. Bele identifies himself as an official from the Commission on Political Traitors from Cheron, who has come to apprehend Lokai.
When Bele is brought to sickbay to see Lokai, we learn that Bele has been pursuing Lokai for a long time; 50,000 Earth years as it turns out. Bele charges that Lokai led a revolt of people who are black on the left side against the ruling order, which is black on the right side. Lokai counters that the black/right (white/left) order enslaved the white/right (black/left) people of Cheron and continues to oppress them. Bele demands that Kirk surrender Lokai, while Lokai claims political asylum with the Federation. Kirk ends the bickering and submits a report to Starfleet Command, looking for a solution.