Star Trek: Season 2, Episode 18

The Immunity Syndrome (19 Jan. 1968)

TV Episode  -   -  Action | Adventure | Sci-Fi
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Ratings: 7.6/10 from 725 users  
Reviews: 12 user | 3 critic

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

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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?


This is the second episode where McCoy is referred to as Captain McCoy instead of Dr. McCoy, this time by Spock. The first was Star Trek: The Deadly Years (1967) where Scotty said it. See more »


Kirk refers to Lt. Kyle as "Cowell" throughout the episode; the correct name appears in the end credits. See more »


Capt. Kirk: Spock?
Dr. McCoy: What is it, Spock? Are you in pain?
Mr. Spock: Captain, the Intrepid. It just died. And the four hundred Vulcans aboard, all dead.
See more »


Featured in Harlem Theatre (1968) See more »

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User Reviews

The Enterprise attacks a giant amoeba
29 December 2007 | by (United States) – See all my reviews

The Immunity Syndrome" feels like a first-season episode – not a lot of action, but plenty of drama. In most other TOS episodes, the villain is an alien race or some psychotic member of the Federation. In this episode, the villain is a giant amoeba. Not one of Trek's more memorable villains.

I hated this episode when I was a younger. Not enough action, no planet to visit, Klingons to fight or Trek babe to drool over. But it seems to grow on me as I get older. I can appreciate this episode for the drama and certainly don't consider it a stinker anymore. However, I wouldn't put in the top half of best Treks, though it's probably somewhere near the top of the bottom half.

I'm giving "The Immunity Syndrome" a C+ grade.

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