Attention, Superman, this is the Spider Lady.
3 seconds sound clip from Superman (1948) - A Job For Superman (Chapter 5).
You can hear this line at 00:10:13.880 in the Blu-ray version of the episode.
Quote context
[...]
- I'll make it up to you somehow, Lois.
- I can identify those two men who abducted you if I see them again.
- Better leave that to Superman too.
- Turn that on. Police wavelength.
- Attention, Superman, this is the Spider Lady.
- Something of great importance to you will be stolen tonight from the Metropolis Museum.
- Nothing you can do will prevent it.
- I tell you this because I've discovered your one weakness.
- You will not dare interfere with my plans.
[...]