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
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
Incredible. Not only should it have been destroyed by our phasers, it does not even register on my tricorder.
Captain, it doesn't even look real.
It is not life as we know or understand it, yet it is obviously alive. It exists.
And it can bear up under full phaser power.