Before I left the vault, I fixed things to wreck the Reducer Ray and get rid of that Lane girl.

6 seconds sound clip from Superman (1948) - Between Two Fire (Chapter 10).

You can hear this line at 00:08:19.282 in the Blu-ray version of the episode.

Quote context

[...]

- Conrad will stay with you.

- Better speed up on the work, Dr. Graham. We're impatient to see the result.

- I'm doing my best.

- What plays?

- I'll tell you inside.

- You make with the ray machine, Dr. Graham.

- Before I left the vault, I fixed things to wreck the Reducer Ray and get rid of that Lane girl.

- Too bad you didn't succeed.

- What do you mean?

- Superman arrived at the university in time to save both Lois Lane and the ray machine, according to the news flash.

- Well, at least I have sketches and photographs to duplicate it.

[...]