Star Trek: Season 2, Episode 18

The Immunity Syndrome (19 Jan. 1968)

TV Episode  -   -  Action | Adventure | Sci-Fi
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The Enterprise encounters a gigantic energy draining space organism that threatens the galaxy.



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Episode complete credited cast:
John Winston ...


The Enterprise is sent to investigate the disruption of the Gamma VII-A solar system and the destruction of the U.S.S. Intrepid, staffed solely by Vulcans. When they arrive they find a large dark mass floating in space that is draining energy from everything around it, including the Enterprise. Drawn into the mass, they find a huge amoeba-like creature and Kirk must decide which of his two friends, McCoy or Spock, to send into it aboard a shuttle craft on a mission of no return. Written by garykmcd

Plot Summary | Plot Synopsis


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Release Date:

19 January 1968 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


The giant space amoeba the Enterprise encounters measured over 18,000 kilometers in length. For comparative purposes the planet Earth has an average diameter of just over 12,500 kilometers. See more »


At one point during Kirk, Spock, and McCoy's discussion of using a shuttle craft to determine how to destroy the organism, McCoy crosses over so that he is next to Spock, but the cuts between them show the same exact background, even though they are facing each other (This was done this way because there was no wall on the set behind McCoy, from Spock's point of view). See more »


Spock: [in shuttlecraft] Oh, and Dr. McCoy, you would not have survived it.
Dr. McCoy: [on bridge of the Enterprise] You wanna bet?
See more »


Referenced in Star Wars: Episode IV - A New Hope (1977) See more »

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User Reviews

The most basic building block of animal life.
1 February 2014 | by (Buffalo, New York) – See all my reviews

One of the most fascinating things I have always found about this particular Star Trek episode is that no one brought in the prime directive when dealing with what they found. In fact it was life in its most basic form after exponentially increasing to the size of a couple of solar systems.

No doubt in the world about what to do with a one cell organism that size. It can't think and reason, all it does is eat and reproduce and we don't want more than one of those roaming around the galaxy.

Leonard Nimoy and DeForest Kelley do take their rivalry to some absurd levels in this episode. Nevertheless the whole Enterprise team pulls together as a team to beat this thing.

How do you deal with an organism? Go back to biology one for the answer.

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