King Hiss is the supreme ruler of the sinister of the cruel race known as the Snake Men and arch-nemesis to Zodak, the Cosmic Enforcer. In ancient times, the Snake Men nearly conquered Eternia. King Hiss confronted King Grayskull before the Evil Horde, led by Hordak would attack. During the "Great Wars" Shiela, the brother of Zodak was eaten by King Hiss. The Snake Men where defeated by the Elders and mystic Zodak, but would ions later return from their prison. King Hiss was the original inhabator of Snake Mountain.