20 user 7 critic

Operation - Annihilate! 

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


Herschel Daugherty


Steven W. Carabatsos, Gene Roddenberry (created by)




Episode complete credited cast:
William Shatner ... Capt. Kirk / Sam Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
James Doohan ... Scott
Joan Swift Joan Swift ... Aurelan Kirk
Maurishka Maurishka ... Yeoman Ellen Zahra
Majel Barrett ... Nurse Christine Chapel
George Takei ... Sulu
Nichelle Nichols ... Uhura
Craig Huxley ... Peter Kirk (as Craig Hundley)
Fred Carson 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


TV-PG | See all certifications »


Official Sites:

Official site





Release Date:

13 April 1967 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:




Aspect Ratio:

See full technical specs »

Did You Know?


The chairs that were seen in Chief Vanderberg's office in Star Trek: The Original Series: The Devil in the Dark (1967) were recycled for Sam Kirk's office, albeit painted pink. See more »


When all is done, Kirk tells Spock to set course for their next assignment. Spock is at the science station on the other side of the bridge from the helm, where course and speed would be set. By naval tradition, the captain gives the first officer course instructions, who then relays those orders to the crew. Star Trek was inconsistent in following this tradition, but it was used in several episodes, including this one. See more »


Capt. Kirk: [narrating] Captain's log, stardate 3289.8. I am faced with the most difficult decision of my life. Unless we find a way to destroy the creatures without killing their human hosts, my command responsibilities will force me to kill over a million people.
See more »

Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Spoofed in Futurama: The Day the Earth Stood Stupid (2001) See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Strange Flat Creatures, Spock Blinded
7 January 2017 | by Rainey-DawnSee all my reviews

Season 1, episode 29. The Enterprise is tracking a strange straight line pattern where all of the inhabitants of the planets in line are going crazy and dying - some are killing themselves. The next planet in line is Deneva, a Federation Outpost where Kirk's brother Sam is stationed. Kirk, Spock & McCoy beam down to the planet to investigate and to visit Sam and his family. What they find are strange flat flying creatures attacking people and everyone on the planet are either going crazy, dying or already dead. When they get to Sam's place they find Sam is dead, Sam's wife starting to go mad then suddenly dies and Sam's son in a comatose state and dying. Spock is attacked by one of the creatures. The 3 beam back aboard the ship with Kirk's comatose nephew. Kirk, Spock and McCoy race to find the answers and cures, in the process Spock is blinded.

I actually found this episode quite entertaining. The dialogue between Kirk, Spock and McCoy is really good. It shows just how great of a team the three of them are: different ideas, opinions but working together they create good theories and solutions.


3 of 4 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 20 user reviews »

Contribute to This Page

Free Movies and TV Shows You Can Watch Now

On IMDb TV, you can catch Hollywood hits and popular TV series at no cost. Select any poster below to play the movie, totally free!

Browse free movies and TV series

Recently Viewed