• Production Code: 67
• Stardate: 5784.0
• Original Air Date: Nov 22, 1968
• Writer: Meyer Dolinsky
• Director: David Alexander
• Guest Stars:
  • Michael Dunn (Alexander)
  • Liam Sullivan (Parmen)
  • Barbara Babcock (Philana)
  • Majel Barrett (Nurse Chapel)
  • Ted Scott (Eraclitus)
  • Derek Partridge (Dionyo)

The Enterprise is summoned urgently to assist the seriously ill Parmen, head of the planet Platonius. After McCoy manages to give Parmen the necessary elixirs, Parmen and his fellow Platonians use immense telekinetic powers to force Kirk, McCoy and Spock to stay on the planet and behave as puppets to Parmen's whim for their amusement. The only Platonian showing disgust at the others' abuse of their power is Alexander, but he is also apparently the only Platonian incapable of telekinesis, and he cannot assist the landing party as they try to escape Parmen's control.