We are the most complex creature on this planet, a big brained, two-legged mammal. We’ve risen from the raw materials of the Earth to dominate and shape it. Wind the clock backwards and the story of how we got to be us is a puzzle that defies all logic. Through nearly 4 billion years of evolutionary twists and turns, disasters strike, predators threaten to wipe us out. From rodent to reptile, we face extinction at every turn, from the land into the water, fighting to survive every step of the way, from fish to worm, back to the very first spark of life, to a single simple cell. One change or predator along the way and this extraordinary story would have never been told.