Alien Mefilas (メフィラス星人 Mefirasu Seijin? Mefilas Star-people), alternatively spelled Alien Mephilas, are a race of recurring aliens in the Ultra Series who originate from the Planet Mefilas. Alien Mefilas' name originates from the German book "Mephistopheles", also they are colored black and silver as opposed to Ultraman's red and silver. Three of their people have tried to take control of the Earth, the first being thwarted by Ultraman, second was killed by Taro, and the final was a servant of the Alien Empera. Two other members had encountered the Ultra Crusaders away from Earth.