Dr who forth doctor quotes The Android Invasion

The Doctor: It's a robot detector. It lights up in the presence of androids.

Android Colonel Faraday: ...Thing must be faulty!

The Doctor: I don't think so. I see I was just too late.

The Android Doctor: A pity you had to find out. We didn't want any shooting until our takeover was complete.

The Doctor: Hello, Doctor! We've been waiting for you.

The Android Doctor: Stand back, Doctor!

The Doctor: You know, the resemblance is astonishing! For a moment, I thought I was seeing double!

Android Benton: Hold it, Doctor!

The Doctor: Don't be a fool, Benton! I'm one of you!

Android Benton: But--

The Doctor: Didn't you hear the Colonel just now? The Doctor's not here.He's at large somewhere in the complex!

Android Benton: Oh, yes, of course, sir. I'm sorry, sir.

The Doctor: Oh, that's all right, Benton-- but keep your wits about you. Nobody knows who's who around here!