That's right. Apparently they let us land because they weren't afraid of a single ship, but they would undoubtedly blast it at an invading fleet.

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

You can hear this line at 00:03:44.240 in the Blu-ray version of the movie.

Quote context

[...]

- 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.

- They apparently can control the reaction so they will work either as a disintegrating ray or as an explosion like our atomic bomb.

- Well, if their weapons are that powerful it would be impossible for our people to attack them here, even if we had rockets enough to transport an army.

- That's right. Apparently they let us land because they weren't afraid of a single ship, but they would undoubtedly blast it at an invading fleet.

- Then hadn't we better go back right away and warn our people?

- Our orders were to find out if the attacks were coming from here and if so, to try to figure out some way to stop them.

- And those are large orders. All we have is a light machine gun and some hand grenades. They wouldn't do much to that walled city.

- No.

- But there was one of their ray guns in Retik's laboratory. If I could get hold of that, it would be easy to blast open their pressurized buildings and really put them out of business.

[...]