Retik the Ruler told me they plan to attack after their saboteurs here have accomplished their mission.
5 seconds sound clip from the Radar Men from the Moon - Flight of Destruction (S1E4) movie soundboard.
You can hear this line at 00:02:54.340 in the Blu-ray version of the movie.
Quote context
[...]
- What do you think their chances are of succeeding?
- You've seen what the ray guns have already done here.
- Perhaps our best move would be to attempt an attack on the Moon.
- But we just can't sit here and wait to be attacked.
- Yes, that's certainly the first thing to do.
- You know some of the saboteurs don't you?
- Yes, well, that is by sight.
- And my flying suit gives me a considerable advantage in running them down.
- Right.
- I'll have you notified whenever there's another attack.
[...]