When the scientists take Allen away in the elevator, it's clear that it's merely a studio mockup. There's no metal strip on the floor to indicate where the floor ends and the elevator begins.
Control Voice: (opening narration) Is this the day? Is this the beginning of the end? There is no time to wonder. No time to ask why is it happening, why is it finally happening. There is time only for fear, for the piercing pain of panic. Do we pray? Or do we merely run now and pray later? Will there be a later? Or is this the day?
Gainer: Now I don't care what reading of history you take. The pattern is always the same. Whenever a bacterium invasion strikes or a fire rages or a wild beast roams the streets. Then and only then do men stop fighting each other and work together to save themselves. A common enemy, a common fear. That is the only answer. If all the men of the Earth are threatened by an enemy from a hostile planet... well, gentlemen, we are going to create that enemy.
Gainer: Ah, yes, I see a long journey in your future. During which you will become a small, dark stranger.
Allen: Stay back. Stay back. You think your putty little hands can hold Prometheus? Odysseus? Tychostar?
Allen: Can it really work?
Gainer: Allen, there are no absolutes. You know that better than anyone. I put your probability of success at 70, 80%. Millions of soldiers have gone into battle, wars of hate, with less odds. And with less cause.
Allen: I... did need that. Thanks.
Yvette: You killed him. And for what?
Gainer: Yvette... if he could go so far to save us all, maybe everywhere people... all of us might be shamed into stopping just a little to save ourselves.
Control Voice: (closing narration) Scarecrows and magic and other fatal fears do not bring people closer together. There is no magic substitute for soft caring and hard work, for self-respect and mutual love. If we can learn this from the mistake these frightened men made, then their mistake will not have been merely grotesque. It will have been at least a lesson--a lesson at last to be learned.
The creature in this episode was judged by some local TV stations to be too frightening for younger viewers, so the final scenes with the creature were not aired in some markets.
Allen: I am Caliban. With a PhD.
Referencing the hideous beastman in Shakespeare's The Tempest. The son of a devil, Caliban is found by Prospero. Although Prospero initially befriends him, he enslaves Caliban when the beastman tries to rape Miranda.