Superman never hesitates to come to the rescue of anyone in danger. Put one of his friends on the spot, and he'll do the rest.
7 seconds sound clip from Superman (1948) - Into The Electric Furnace (Chapter 7).
You can hear this line at 00:04:46.444 in the Blu-ray version of the episode.
Quote context
[...]
- We've seen it work. It really knocks him out.
- No, but perhaps if he were exposed to it long enough...
- I'll study it. Perhaps some way may be found to use it against Superman, wherever he is.
- No, I haven't yet. But I hope to.
- In the meantime, why not trap Superman again and expose him to the kryptonite?
- We might trick him into coming here.
- This is the last place I want him, even with the kryptonite.
- Then why not work on that Daily Planet guy, Clark Kent? Superman seems to keep in touch with him.
- We'll have to plan it very carefully.
- Ah, ah, ah. City room. Clark Kent isn't here. Who wants him?
[...]