Billy Zane’s career trajectory has clearly taken a downturn since “Tombstone,” and this film might represent an even lower point. He portrays the unpleasant king "Laypach," whose reign, according to legend, can only be ended by a mild-mannered farm boy who happens to be the descendant of Promethea's previous ruler. That farm boy is "Magnus" (Sam Murphy), who’s aware of his heritage and decides to liberate his people …