Star Trek: Season 1, Episode 29

Operation -- Annihilate! (13 Apr. 1967)

TV Episode  -   -  Action | Adventure | Sci-Fi
Your rating:
    1 2 3 4 5 6 7 8 9 10 -/10 X  
Ratings: 7.5/10 from 859 users  
Reviews: 12 user | 8 critic

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



, (created by)
0Check in

Watch Now

$0.00 with Prime Instant Video

Editors' Spotlight

Alpha House Premieres Today

All ten episodes of the second season of "Alpha House" are available starting today. Watch them now, only on Prime Instant Video.

User Lists

Related lists from IMDb users

a list of 30 titles
created 19 Aug 2012
a list of 100 titles
created 24 May 2013
a list of 44 titles
created 03 Jun 2013
a list of 443 titles
created 18 Aug 2013
a list of 80 titles
created 1 month ago

Related Items

Connect with IMDb

Share this Rating

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

Operation -- Annihilate! (13 Apr 1967) on IMDb 7.5/10

Want to share IMDb's rating on your own site? Use the HTML below.

Take The Quiz!

Test your knowledge of Star Trek.
« Previous Episode | 30 of 80 Episodes | Next Episode »





Episode complete credited cast:
Joan Swift ...
Maurishka ...
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


See all certifications »


Official Sites:



Release Date:

13 April 1967 (USA)  »

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


The actual building where Spock is attacked by the parasite is now a cafeteria belonging to Northrop Grumman Aerospace. See more »


When Spock stuns the creature to take as a specimen, it lands face down, but close-ups show it face up. See more »


[the landing party shoots down one of the alien life forms]
Spock: Incredible. Not only should it have been destroyed by our phasers, it does not even register on my tricorder.
Yeoman Zahra: Captain, it doesn't even look real.
Spock: It is not life as we know or understand it, yet it is obviously alive. It exists.
Capt. Kirk: And it can bear up under full phaser power.
See more »


Referenced in Star Trek II: The Wrath of Khan (1982) See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

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 attaches 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 to 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.

0 of 0 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Things that bugged you when you watched as a kid flashgordan
Coolest Special Effects? gavbrown01
Great lines in lesser episodes Ruddfactor-2
Spock and The Bangles Wasteland_Vault_Boy
Do remember your first Star Trek episode you ever watched? Deputy_Fife
Subtle problem with The Doomsday Machine david-h-downing
Discuss Operation -- Annihilate! (1967) on the IMDb message boards »

Contribute to This Page

Create a character page for: