They are merely softening up your defenses for our impending invasion.

— Retik Ruler Of The Moon (Roy Barcroft)

4 seconds sound clip from the Radar Men from the Moon - Moon Rocket (S1E1) movie soundboard.

You can hear this line at 00:17:15.240 in the Blu-ray version of the movie.

Quote context

[...]

- I am Retik, ruler of the Moon.

- Apparently you are expecting me.

- Of course.

- For many years our radio has kept us informed of events on Earth and my men there have advised me of your every move.

- I see you have adopted our language.

- Yes, all our people are required to speak English, so we can operate more efficiently in your country.

- You mind telling me why your men are carrying out that campaign of destruction on Earth?

- Not at all.

- They are merely softening up your defenses for our impending invasion.

- Why do you want to invade the earth?

- Because the atmosphere on the moon has become so thin and dry it is impossible for us to raise food except in pressurized greenhouses.

- And none of us can move outside without helmets.

- So we are planning a mass migration to your world.

- You will find that conquering the earth isn't so simple.

- Ah, but it will be because of our atomic weapons.

[...]