Captain Kirk is informed by his old friend, Dr. Thomas Leighton, that the head of a Shakespearean acting troupe on his world was once known as Kodos the Executioner. As Governor of Tarsus IV, Kodos had most of his colony killed when food supplies ran short rather than have so many starve. The only surviving witnesses to his actual appearance are Kirk, Leighton, and a young crewman on the Enterprise. Kirk dismisses Leighton’s accusations until he turns up murdered, and his young crewman nearly so. The head of the Shakespearean acting troupe, Anton Karidian denies that he’s Kodos. Is he telling the truth? If so, who’s behind the murders?