That will not be necessary, gentlemen.
2 seconds sound clip from the 20 Million Miles to Earth (1957) movie soundboard.
You can hear this line at 00:47:23.415 in the Blu-ray version of the movie.
Quote context
[...]
- Sharman wrote that the basic diet of these creatures is sulfur, raw sulfur.
- There are rich sulfur beds in Sicily, not many kilometers from here at the base of mount Etna.
- We'll scour that mountain area as soon as it's light. If the creature's there, we'll recapture it.
- That will not be necessary, gentlemen.
- There is no longer time to recapture the monster alive
- I must inform you, signore, that there is no more cooperation between us.
- The beast must be destroyed. He has injured one man badly and he might kill others.
[...]