- Narrator: [Opening Narration] Plot or paranoia? There was no doubt in David Vincent's mind. A celebrated astrophysicist, Dr. Curtis Lindstrom, had discovered the truth: that alien beings were here on earth. In less than a week, at a meeting of his colleagues, Dr. Lindstrom would announce it to the world. Then perhaps David Vincent could put down his burden. It all seemed so simple.
- Narrator: [Epilog Narration] For David Vincent, another beachhead destroyed. For the Invaders, evidence that the human race can never be enslaved.
- David Vincent: Lloyd, I understand betraying me, but why your father? Why?
- Lloyd Lindstrom: My father was an enemy. What happened to him was necessary, was all necessary. What are you afraid of? They're not going to execute you. They're just going to change your brain patterns, impose their will on yours, that's all.