Airdate: November 29, 1968
69 of 80 produced
66 of 80 released
Introduction
The crew of the Enterprise responds to a distress call from the civilization of Scalos, but is perplexed when they find no one there, and when one of their crew vanishes. Upon return to their vessel, odd things begin to happen, culminating with the disappearance of the Captain himself.Can the crew of the Enterprise uncover the secret of Scalos before it's too late?
One of these things... is not like the others...
