The Inca God of the Sun was lonely and was searching for a wife. He knew that the Panther of the Night had captured a beautiful Moon Goddess, and had imprisoned her within its ribcage. However, the Panther was invulnerable as long as it was underneath the surface of the River of Darkness.
The Sun God devised a plan, and while standing on the surface of the River, pulled the Panther out by its eye-sockets, so that he wasn't bitten by its dangerous fangs. With his other hand, he reached into the Panther's now exposed ribcage and rescued the Moon Goddess. As soon as the two beings of light touched, their combined light grew brighter, and she became pregnant. However, the Panther had scratched a deep scar on the Sun's arm, and bright drops of glowing blood fell on the River, and became the Milky Way.
So the Sun and the Moon created the Earth and all life that lived on its surface. The Panther also sent his spirit to torment the Earth and every month tries again to reclaim the Moon.