'Obviously we must track down this monster and destroy him... before he destroys us.'

9 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.

You can hear this line at 00:13:11 in the radio play.

Quote context

[...]

- Where is the creature and what is he up to?

- Eat your cereal, Bobby.

- Aw, Mom, I'm almost full as it is.

- Bobby.

- Okay, Mr. Carpenter

- I'm sorry, Mrs. Crockett. Please go on reading.

- 'If he could build a space ship that can fly to Earth and a robot that can destroy our tanks and guns, what other terrors can he unleash at will?'

- What a man.

- 'Obviously we must track down this monster and destroy him... before he destroys us.'

- Correct! Then why don't they do it?

- This space man or whatever he is. We automatically assume he's a menace. Maybe he isn't after all.

- Well, then, where is he? What's he up to?

- Maybe he's afraid.

- Ah, he's afraid!

- Well, after all, he was shot the minute he landed here.

[...]