Having found a Federation colony of 100 people completely destroyed, Kirk and the Enterprise have to deal with a nearby Klingon vessel which they believe must be responsible for the colony's destruction. When the Klingon ship is disabled, they, in turn, assume they were attacked by the Enterprise. There is obvious tension between the Enterprise crew and its Klingon enemies. Unbeknown to Kirk and his Klingon counterpart, Kang, this is the work of an alien being that gets its energy from the friction and emotions between sentient beings. The natural animosities between the two parties feed its appetites. When the creature is beamed aboard the Enterprise, it purposely creates tension among the crew, to its benefit. The situation eventually forces Kirk and Kang to work together to defeat it. Written by
Did You Know?
Mara is the only female Klingon with a speaking role on Star Trek
(1966): The Original Series. Another female is beamed on board the Enterprise at the same time, but only seen briefly. See more
When the Entity begins to take over the Enterprise by increasing its speed and taking it on a course out of the galaxy, the scene begins to shake suggesting it is a rough ride for the crew. As the scene changes from the bridge to Engineering, Scotty is explaining to Captain Kirk that the engines have "Gone to Warp 9, by themselves". As he is saying these words, the scene suddenly stops shaking. There are no other indications that the ride has suddenly become smooth. The camera operators and/or the special effects team are completely out of sync. See more
Captain James T. Kirk
[referring to the parasitic alien
It exists on the hate of others.