Magic Serpent, The (U.S. Version) (1966)

aka’s: Kairyu Daikessen/Battle Of The Dragons/Ninja Apocalypse/怪竜大決戦

In ancient Japan, a good lord is killed and his throne is taken by the treacherous Yuki Daijo and his wizard friend Oroki-maru. The young prince Ikazuki-maru is rescued from the jaws of death by a magic bird sent by a wizard. Ten years later, Ikazuki-maru embarks on an adventure to avenge his parents and the wizard's death with his magic powers he learned from the wizard.