- The Mysterons: This is the voice of the Mysterons. We know that you can hear us Earthmen. We will continue to take our revenge and deal yet another devastating blow. We will destroy the Triumvirate of Europe. The Triumvirate of Europe will be destroyed.
- Colonel White: Whoever it was had specific information about the base's security electronics, and played his hand with the cunning of a fox. This Mysteron agent is one of the most dangerous we have ever faced.
- Professor G.A. Carney: [on the phone] Johnson? Professor Carney. I'm taking a vacation, starting immediately. Oh, let's say uh... special research... no, I can't say when I'll be back. Goodbye.
- Security Base Guard 1: Listen... . I'd know that sound anywhere. They're bringing up tanks.
- Colonel White: Tanks! How in heaven's name did they get past our aerial surveillance?
- Captain Ochre: Vandon Base is wonderfully equipped, sir. We're 40 feet underground.
- Conrad Olafson: I feel like some kind of prisoner.
- Captain Ochre: It's very necessary, sir. Your safety is Spectrum's responsibility. You'll be safe here.