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 705 users  
Reviews: 11 user | 3 critic

The Enterprise encounters a gigantic energy draining space organism that threatens the galaxy.



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Title: The Immunity Syndrome (19 Jan 1968)

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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?


This is the second episode where McCoy is referred to as Captain McCoy instead of Dr. McCoy, this time by Spock. The first was S. 2, Ep. 12, "The Deadly Years" by Scotty. See more »


When McCoy and Spock leave the bridge after Spock's near-collapse in the opening scene, Kyle, at the helm, is wearing a red shirt. McCoy gives Spock an examination, but does not confine him to Sickbay, so we can surmise that Spock is only off the bridge for a couple of hours at the most. When he returns, Kyle is wearing a gold shirt. See more »


Mr. Spock: [form the shuttlecraft] This is Spock. I am slowly losing life support and minimal shield energies. According to my calculations...
Mr. Spock: ...nervous energy of the organism...
[louder static]
Mr. Spock: maximal... just within... its outer... protective... membrane. Relatively insensitive to interior irritation.
Mr. Spock: Believe sufficient charge of...
Mr. Spock: ...could destroy the organism. Tell Dr. McCoy...
See more »


Spoofed in XXX Trek: The Final Orgasm (1999) See more »

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User Reviews

Well-written, visually-striking, mind-blowing.
29 November 2008 | by (Los Angeles) – See all my reviews

One of the best and most memorable episodes of the original Trek series.

First off, the "star" of the show: the gigantic space-amoeba critter was such an impressive sight in the original series, that when it was re-released in the recent "enhanced" episodes with remastered HD format and state-of-the-art effects, the creature itself was left virtually unchanged. In fact, IMO, the critter looked better unenhanced.

This is doubly impressive in light of the show's budget limitations, being a relatively inexpensive process put to very good effect.

On top of that, the writing doesn't fall into the bogus-science 'treknology' gibberish and continuity problems that plagued and dragged so many episodes into mediocrity. The science in this episode is rock-solid, one of the few Trek episodes that qualifies as true hard-core science fiction.

The story itself is slowish for Star Trek, more brooding than action, but it works without insulting your intelligence in the process.

9 of 9 people found this review helpful.  Was this review helpful to you?

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