So Retik plans to invade the Earth with his army from the Moon.

3 seconds sound clip from the Radar Men from the Moon - Molten Terror (S1E2) movie soundboard.

You can hear this line at 00:03:06.010 in the Blu-ray version of the movie.

Quote context

[...]

- On the Moon we have an element, Lunarium, which is far superior to uranium as a base for atomic reactions and we can completely control the force of these reactions enabling us to build atomic weapons ranging from huge cannon to these small ray pistols.

- It's very considerate of you to give me all this information.

- You deserve some reward for your long journey, but unfortunately I cannot permit you to return to Earth with it.

- Maybe I have something to say about that.

- So much for the effectiveness of your weapons. Now I will demonstrate one of ours.

- So Retik plans to invade the Earth with his army from the Moon.

- As soon as the saboteur's, he already has their finish softening up our defenses.

- Do you think he'll be able to do it?

- I'm afraid he might.

- I don't know how many men or rocket ships he has, but his atomic weapons are so far ahead of anything we have he wouldn't need a very big army.

- What did you find out about the ray guns?

- Only that they use an element called Lumarium instead of uranium as the base for their atomic reactions.

[...]