It won't be long now. It will be midnight in 10 minutes.
2 seconds sound clip from Superman (1948) - Into The Electric Furnace (Chapter 7).
You can hear this line at 00:14:09.433 in the Blu-ray version of the episode.
Quote context
[...]
- Remember one thing. If this is a trap you're fixing up, you're in it too.
- Will Superman definitely show up?
- All right. Keep your eyes straight ahead. Someone will take you there.
- Well? Our agreement was that you'd let Jimmy go.
- So I heard. But I didn't agree.
- Oh, but you must, otherwise Superman won't appear.
- I think he will. And on time as usual. And when he does, we'll give him a shot of this.
- It won't be long now. It will be midnight in 10 minutes.
- Why doesn't Superman come as promised?
- Probably because you didn't release Jimmy as promised.
- He wouldn't know whether we did or not.
- Oh, that's where you're wrong.
- Let's get rid of these two and clear out of here.
- That blast furnace is made-to-order for the job.
- Now, you can't hope to defeat Superman.
- We're going to. And with Dr. Hackett's help we'll get the Reducer Ray machine.
[...]