The crew is infected with a mysterious disease that removes people's emotional inhibitions to a dangerous degree.



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Episode complete credited cast:
Stewart Moss ...
Bruce Hyde ...
William Knight ...
Amorous Crewman
John Bellah ...
Laughing Crewman


When Lieutenant Junior Grade Tormolen brings aboard an infection that killed the science team on Psi 2000, the crew of the Enterprise soon find themselves unable to control their most pre-dominant emotions. Soon the entire starship is in a shambles and plummeting toward the self destructing planet. Written by The TV Archaeologist

Plot Summary | Plot Synopsis


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Release Date:

29 September 1966 (USA)  »

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Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Soundtrack: when Riley walks down the passageway to sickbay, the soundtrack plays the opening measures of Percy Grainger' s Rutherford Park Poachers. See more »


When Spock enters the briefing room after being infected, the "Briefing Room 2" sign hangs on the bulkhead to the left of the door. When Kirk exits the same briefing room later, the sign is now hanging to the right of the door. See more »


Sulu: Stand, no farther. No escape for you. You'll either leave this war bloodied, or with my blood on your swords.
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Referenced in King of the Nerds: Nerds to the Rescue (2014) See more »


Theme From Star Trek
Written by Alexander Courage
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User Reviews

Id Impulses
24 April 2014 | by (United States) – See all my reviews

A nicely done episode that is based on a virus that is brought on board the ship by an away team. They have been on a planet where several people have died due to mysterious circumstances. It is transferred through simple touch. This virus has as its symptoms, the display of irrational behavior, founded in the inner mind of the crew members. Each crew member begins to show emotions held deep inside them. This is a theme that will be used many times. We also are exposed to the foundational makeup of each of the major crew members. Spock, for one, shows emotion (remember that the Vulcans were once an emotional people who repressed it to become more efficient and calculating). This is the first episode where the crew members begin to actually interact. Relationships are forged. It is the first episode where a crew member must fly in the face of an epidemic, a threat from within. Many are to follow. The acting is better and the story is creative and challenging. Fear is the issue here.

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