We know the Spider Lady is determined to get it, but we don't know her whereabouts. This is a chance to bring her into the open.
5 seconds sound clip from Superman (1948) - Superman To The Rescue (Chapter 8).
You can hear this line at 00:06:21.531 in the Blu-ray version of the episode.
Quote context
[...]
- 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.
- It is rumored that Superman will guard the ray machine.
- My Washington contact has informed me as to the route chosen.
[...]