Episode 2: Out of Time
The Doctor suddenly stops, absently correcting Jenny, "You mean exterminate." Then he nods, and says, "You're right, I'm getting ahead of myself. We need information, not to send this being into a panic. Yet, anyway. I'll hang back, just out of sight, while you go back in to try to find out more. If I need something specific asked, I'll whisper to you. We'll do this in the style of Cyrano de Bergerac!" He says this last bit with dramatic flair.