The crew is infected with a mysterious disease that removes people's emotional inhibitions to a dangerous degree.
Episode rating
Cast of episode
- Captain James Tiberius 'Jim' Kirk
- Mister Spock
- Hanar
- Nurse Chapel
- Kevin Riley
- Dr. McCoy
- Yeoman Rand
- Sulu
- Scott
- Uhura
- Amorous Crewman
- Crewman I
- Crewman
- Lieutenant Hadley
- Lt. Brent
- Yeoman Smith
- Lieutenant Leslie
- Crewman #2
- Crewman