Smallville, Season 4

Jor-El:
I knew you would return, my son.

Clark:
Why'd you send me to find this?

Jor-El:
Because you may be the last survivor of a great civilization.

Clark:
A great civilization that destroyed itself!

Jor-El:
As will yours if you continue to refuse your mission. The knowledge of our civilization was encoded in three stones brought to Earth and hidden at the far reaches of the world. Greed will drive others to hunt the stones. But if the humans should unite them before you, they will not be able to withstand the temptation and will drive the world to famine, war, and the Earth's ultimate destruction. You must find the other two stones. The fate of your world lies in your hands... Kal-El.