Charlton Heston (The Opening Narrator):"This is the Earth at a time when the dinosaurs roamed a lush and fertile planet. A piece of rock just six miles wide changed all that.
It hit with the force of ten thousand nuclear weapons. A trillion ton of dirt and rock hurtled into the atmosphere, creating a suffocating blanket of dust the sun was powerless to penetrate for a thousand years.
It happened before. It will happen again. It's just a question of when."