Before we get started on ships using regular rocket fuel, let's do some experimenting with atomic power from lunarium.

6 seconds sound clip from Radar Men from the Moon - Death of the Moon Man (S1E12).

You can hear this line at 00:12:21.495 in the Blu-ray version of the movie.

Quote context

[...]

- Get the gun ready, quick!

- Now that Retik's dead, we feel sure there's no immediate danger of any enemy invasion from the moon. And we'll have time to build an adequate defense.

- Will you want us to make another trip to the moon to see what's going on?

- I don't think so.

- Now that the moon men's attack has failed. We can make the whole story public and the military authorities can take charge.

- But we will need more of your rocket ships, Commando, so I suggest you make plans for going into their manufacture on a large scale.

- Before we get started on ships using regular rocket fuel, let's do some experimenting with atomic power from lunarium.

- That might be pretty hard to control.

- No, I've got it all figured out. Stand back, please.

- Look, by setting the controls on this model rocket, I can make it slowly circle the room and come right back. Watch. Here we go! (hissing)

(Toy rocket launch)

- I thought you said it was going to slowly circle the room and come back.

- At least it did come back.

[...]