I'll take care of Dr. Hackett, after I've used him and before he becomes too powerful.
5 seconds sound clip from Superman (1948) - Superman To The Rescue (Chapter 8).
You can hear this line at 00:05:45.879 in the Blu-ray version of the episode.
Quote context
[...]
- How would you like to get away from her?
- I can help you scram out of here for a price.
- What if I did escape? I'd still be running away from the police. No. I'm safe here.
- If you'll excuse me, I must go down to the lower cave to get some materials.
- He didn't fall for it. Been waiting his chance to take control.
- I'll take care of Dr. Hackett, after I've used him and before he becomes too powerful.
- I summoned you for consultation.
- We wish to remove the reducer ray to Metropolis University for further experiments.
- Good. It must be done swiftly and secretly.
- I agree to the swiftness, but not the secrecy.
- At the risk of losing the reducer ray?
- We won't lose it, I promise. But it may enable us to capture the Spider Lady and Dr. Hackett.
[...]