Lionel Luthor, Dr. Frederick Walden and others in “Unfinished Business”

Lionel Luthor

The wall, Doctor. What does it say?

"The last son will rule the planet". Don't you see? It's Clark Kent!

Lex Luthor

I think that's a pretty big leap.

No! I've never seen more clearly in my life. I know exactly what has to be done.

Lionel Luthor

What is that, Doctor?

We have to kill Clark Kent, before he destroys us all.