Walking with Monsters

Narrator:
This is Earth, 4.4 billion years ago. A toxic, sterile ball of scorching rubble. Meteorites rain down on its surface. Clouds of lethal acid smother it. The Earth seemed destined to remain devoid of life... but that was about to change. [a nearby planetoid collides with the Earth in a world-shattering explosion, and their remnants merge] Another planet, Theia, smashed into Earth, and the two planets fused, creating a brand-new world: our world. Even today, Theia lies right beneath our feet. A smaller chunk of Theia became our moon...and slowly, our oceans formed, until life on Earth was ready to begin. But who would inherit this blue planet?