Operator, I'm calling from Metropolis University. There's a man here posing as...
5 seconds sound clip from Superman (1948) - Irresistible Force (Chapter 9).
You can hear this line at 00:13:39.225 in the Blu-ray version of the episode.
Quote context
[...]
- Well, you surely don't think I'd tell you that, do you?
- We're using another method of learning it.
- Make the doctor comfortable.
- Well, Dr. Graham, I have all I need to know. I'll hurry back to the office and write my story.
- Well, thank you. Goodbye, Miss Lane.
- Do you think she suspects anything?
- I thought we'd never get rid of her.
- Operator, I'm calling from Metropolis University. There's a man here posing as...
- Jimmy took this picture of Dr. Graham when Lois met him. It was spotted on page one with her story.
- That's not Graham. That's Hackett.
- Find Clark Kent for me. I think he's gone crazy.
- Yeah.
- Now to find a way to destroy this machine, and then we'll have the only one in existence.
[...]