In what is today central Mexico, a herd of "Alamosaurus" is roaming the plains in search of food. They are giants, even by dinosaur standards. They are 60 feet long and 40 feet tall, and they weigh 30 tons. Their huge size demands that they eat a lot of vegetation to maintain their bulk. Meanwhile, the asteroid enters the Earth's atmosphere. It is burning brighter than a million suns. The scorching light sears the "Alamosaurus"' eyeballs, blinding them. 