Circle of Iron was released in the year 1978。Circle of Iron is also called as Zelazny krag, The Silent Flute, Messaggi da forze sconosciute, Hiljainen huilu, Geheimnis des blinden Meisters, Círculo de hierro, Círculo de Ferro。

A young martial artist, Cord the Seeker, competes for and loses the right to go on a quest for the Book of All Knowlege held by a wizard named Zetan, but he goes along the path to seek Zetan anyway. Along the way, he meets strange tests and challenges by enemies and allies - often having difficulty determining which is which.

Circle of Iron actors and actresses include David Carradine, Eli Wallach, Roddy McDowall。