Smallville, Season 3

Clark:
Dad, when that serum got close to the kryptonite bomb, it reacted the same way as my blood.

Martha:
So you're saying the serum...

Clark:
I know. It sounds crazy, but I think that Lionel Luthor has found a way to use my blood to bring people back to life. If my blood can save lives, maybe I should come forward. What if there's something inside me that can repair dad's heart permanently?

Jonathan:
Clark, your mother and I both know that you are gonna save a lot of lives in this world, even more than you have any idea.

Clark:
The only life I'm interested in saving is yours.

Jonathan:
You do. You save my life every day that you're with us. And we wouldn't trade that for a single moment without you.