Star Trek: Season 2, Episode 13

Obsession (15 Dec. 1967)

TV Episode  |   |  Action, Adventure, Sci-Fi
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Reviews: 8 user | 6 critic

Capt. Kirk obsessively hunts for a mysterious cloud creature he encountered in his youth.



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Episode complete credited cast:
Stephen Brooks ...
Jerry Ayres ...


Captain Kirk is haunted by a creature from his past when conducting a mining survey on a planet. He first encountered it as a lieutenant aboard the U.S.S. Farragut and blames himself for freezing in a moment of crisis, causing the death of many crewmen. The creature is a cloud-like, gaseous being that lives on the red blood cells found in humans. Obsessed by his desire for revenge and to erase the memory of 11 years ago, he pursues the creature relentlessly, putting in jeopardy an assignment to collect essential medical supplies. Written by garykmcd

Plot Summary | Plot Synopsis


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Release Date:

15 December 1967 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


The ship which Kirk served on for his first deep space mission is disclosed to be the USS Farragut, and was named after David Glasgow Farragut, a flag officer of the United States Navy during the American Civil War. He was the first rear admiral, vice admiral, and admiral in the United States Navy and is credited for uttering the phrase, "Damn the torpedoes, full speed ahead!," disregarding all danger while charging into enemy waters off the Alabama Coast. See more »


Ensign Garrovick states that less than one ounce of antimatter is more powerful than 10,000 cobalt bombs but the actual energy yield is only about 1.2 megatons TNT. The implication that a cobalt bomb releases more energy than a "regular" nuclear weapon is incorrect; a cobalt bomb is just an ordinary thermonuclear weapon "salted" with cobalt to produce long-lived Co-60 in its fallout. See more »


Dr. McCoy: To be so obsessed...
Capt. Kirk: [angrily] Obsessed?
Dr. McCoy: That you could destroy yourself, uh... your career... a young boy who reminds you of yourself eleven years ago!
See more »


Featured in Bring Back... Star Trek (2009) See more »

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User Reviews

Military Drama Posing as a Space Monster Adventure
11 October 2007 | by (Vulcan) – See all my reviews

Obsession features a great Art Wallace script and solid performances by Shatner, Kelley and Nimoy. An away team is investigating a seemingly uninhabited planet, while carrying a cargo of medical supplies to a rendezvous for which they can't be late. A mysterious gas cloud attacks and kills a trio of red shirts by consuming their red corpuscles. Kirk recognizes the smell (literally) of all of this and explains that the last time he encountered this creature, half of his ship's crew was killed. The son if the captain Kirk served with is now a member of the Enterprise crew (Stephen Brooks) and Kirk believes that his hesitation doomed his crew mates. Soon, Kirk's obsessive behavior regarding the gas cloud has the crew questioning his sanity.

Ralph Senensky's direction keeps this classic Shatner episode tight, exciting, and well shot. There are many memorable scenes and the script allows for some very good character development for the young ensign as well as the principal cast members. And unlike the standard Star Trek Space Monster story, this ends up being as much a human-military (naval) drama as it is an adventure tale.

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