On Venus, we discovered quite by accident that these creatures are extremely susceptible to electric shock and that controlled voltage can paralyze them.

7 seconds sound clip from the 20 Million Miles to Earth (1957) movie soundboard.

You can hear this line at 00:49:26.484 in the Blu-ray version of the movie.

Quote context

[...]

- Then I must say that, at daybreak, I intend to use every means at my disposal to destroy that creature before he kills someone.

- But you can't do that!

- Bob?

- Yes, sir?

- May I remind you the commissario is a Sicilian police chief performing the duties of his office?

- I know that, sir, but...

- But what?

- Would there be any objection if Doctor Uhl and I tried to track this animal and take it alive?

- Before the commissario has him destroyed?

- Not for me. Signor Contino?

- How do you propose to do this?

- On Venus, we discovered quite by accident that these creatures are extremely susceptible to electric shock and that controlled voltage can paralyze them.

- Now, if we could have two helicopters and a squad of armed paratroopers, we might be able to drop an electrically charged wire net on the beast.

- A net.

- All I ask, sir, is permission to try.

- If this can be done before any human life is threatened, the Italian government will have no objection.

- All right, Bob, you shall have your copters.

- Thank you, sir.

- Thank you, signor.

[...]