Star Trek: Season 1, Episode 29

Operation -- Annihilate! (13 Apr. 1967)

TV Episode  |   |  Action, Adventure, Mystery
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Ratings: 7.6/10 from 997 users  
Reviews: 13 user | 9 critic

The Enterprise crew attempts to stop a plague of amoeba-like creatures from possessing human hosts and spreading throughout the galaxy.



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Title: Operation -- Annihilate! (13 Apr 1967)

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Episode complete credited cast:
Joan Swift ...
Maurishka ...
Yeoman Zahra
Peter Kirk (as Craig Hundley)
Fred Carson ...
First Denevan
Jerry Catron ...
Second Denevan


The Enterprise traces a virus-like outbreak that seems to be traveling in a direct line across a planetary system. The next planet is home to Kirk's brother Sam, his sister-in-law and their young son. The Enterprise arrives too late however for Sam. They find flying jellyfish-like creatures that attach themselves to humans. They take over the victims nervous system forcing them to bend to their will. Spock finds a weapon to use against the creatures but it leaves him hopelessly blind. Written by garykmcd

Plot Summary | Plot Synopsis


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Release Date:

13 April 1967 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


This takes place in 2267. See more »


(at around 10 mins) There is a person moving in and out of the frame way behind the action during the outdoor sequence. See more »


Dr. McCoy: [holding a beaker of tentacle tissue] Evidently, when the creature attacks it, uh, leaves a stinger much like a bee or a wasp, leaving one of these in the victim's body, and it takes over the victim very rapidly, and the entwining is far, far too involved for conventional surgery to remove.
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Spoofed in Buffy the Vampire Slayer: Bad Eggs (1998) See more »

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User Reviews

Considering Genocide on a Planetary Scale
29 September 2013 | by (Buffalo, New York) – See all my reviews

The Starship Enterprise arrives at the Planet Deneva where Captain James T. Kirk is looking forward to a little personal time with his brother Sam and Sam's wife and son. But it turns out the planet and its people are under attack by some strange collective parasite intelligence which attachs itself to people and forces them to their will under duress of great pain if they don't.

William Shatner's brother died from it and his sister-in-law and nephew are still in its grip. Also Leonard Nimoy is attacked by one of the parasites himself and functions under great pain.

It's a medical problem that DeForest Kelley diagnoses. But surgery is too complex and to have a whole planet undergo it is time consuming and not terribly efficient.

Nimoy proves a useful guinea pig for an experiment that Kelley conducts as to the cure which I won't reveal. But the risk might be genocide on a planetary scale and Kirk is truly reluctant to take that on as a responsibility.

Another episode involving the strain of command and the choices a commander might have to make. These parasites apparently have been making their way through space and it's a question of preventing this from spreading to places like Vulcan and Earth.

Shatner handles it well and Kelley is a good doctor.

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