In ancient times, the Titan Cronus (son of Uranus the sky and Gaia the earth) and his wife Rhea gave birth to six children. Five of them were swallowed by Cronus, and only one was saved, Zeus, hidden from Cronus by Rhea. Upon reaching adulthood, Zeus forced his father to vomit the other five gods. Zeus, along with his brothers and sisters, decided to battle the Titans for control of the universe. Cronus and the other eleven Titans lost the battle and were sent to Tartarus.