The Conscience of the King

The Enterprise visits Planet Q at the request of Dr. Thomas Leighton, a friend of Captain Kirk. Leighton suspects that the leader of a famous acting troupe, Anton Karidian, is actually Kodos The Executioner, the murderous former governor of planet Tarsus IV, where Kirk grew up. Kirk initially disagrees, believing the official story detailing Kodos' death years earlier, but begins to doubt after Leighton is found dead. To confirm Karidian's identity, Kirk arranges for the troupe to perform aboard the Enterprise.[37]