Mm. They've outlived their usefulness.
2 seconds sound clip from Superman (1948) - The Payoff (Chapter 15).
You can hear this line at 00:03:39.253 in the Blu-ray version of the episode.
Quote context
[...]
- And how would you account for the destruction of the jail and the death of the two men?
- I don't know. I wish I could find another explanation.
- There's gonna be more trouble unless we do.
- I think it was a masterstroke, Driller.
- Well, we might have had use for Hackett, if not for Anton.
- Mm. They've outlived their usefulness.
- Graham, for one thing. Yeah, what about him?
- Don't tell me you're going soft and can't take care of the good doctor.
- Hackett never let us know how he kept Graham under control.
[...]