Prometheus, wanting to help humanity, stole fire from Hephaestus and gave it to humans to help them survive. When Zeus discovered this, he had Prometheus chained to a rock where an eagle would eat his regenerating liver as punishment. Years later, Hercules freed Prometheus. Zeus also punished humans by having Hephaestus create Pandora and giving her a box containing all illnesses and vices, which she opened despite being told not to. Her actions caused evil to spread across the earth.