For many years our radio has kept us informed of the events on Earth, and my men there have advised me of your every move.
7 seconds sound clip from Radar Men from the Moon - Mass Execution (S1E10).
You can hear this line at 00:05:34.220 in the Blu-ray version of the movie.
Quote context
[...]
- Well, our passage through space was uneventful. The rocket ship functioned perfectly.
- When we reached the moon, I decided to go on a scouting trip.
- I am Retik, ruler of the moon.
- Apparently you were expecting me.
- 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.
- Do you mind telling me why your men are carrying out that campaign of destruction on Earth?
- They are merely softening up your defenses for our impending invasion.
[...]