Clark and Lois trace a mysterious electrical signal, which has been sent out by Dr. Graham and Jimmy Olsen, prisoners of the Spider Lady in a secret laboratory.
9 seconds sound clip from Superman (1948) - Superman's Dilemma (Chapter 11).
You can hear this line at 00:00:55.017 in the Blu-ray version of the episode.
Quote context
[...]
- Hey, pull up. The kid just jumped out.
- Let him go. If he didn't break his neck, he won't be able to give an alarm until we're safe.
- Lois. Lois. Why don't you answer?
- Can the Spider Lady force Dr. Graham to duplicate this ray machine for her?
- What strange trick of fate put Superman in jail?
- See the amazing answers in Superman's Dilemma, chapter 11 of Superman, at this theater next week.
- Lois. Come in. Come in, Lois. I'm afraid something's happened. Keep trying to contact Miss Lane.
- Why have I been brought back here?
- You'll soon find out, doctor.
- Dr. Graham, your attempt to escape was a complete failure.
- Obviously then, I must try again.
[...]