En los tiempo oscuros, la magia era un arma. El amor un misterio, la aventura estaba en todas partes... y los dragones eran reales. En las postrimerías de la Edad Media, un rey ha hecho un pacto con un dragón, por el cual el soberano le sacrifica vírgenes, a cambio de que la bestia no moleste el reino. Un aprendiz de mago, para salvar a una dama, se enfrentará al temible dragón.
Little David Gordon lives in the jungle with his parents Ruth and Fred, along with their servant Nona. David likes living there while his father captures wild animals; he's made friends with Bomba the jungle boy, who has shown him a great deal about life in the jungle. One day two adventurers come looking for ancient treasure in the shadow of a live volcano.
Head railroad man Dan is as ugly as he is honorable. When he spots a drifter who'd hopped a freight held up by a landslide, Dan offers the man a job; then he finds the man was a railroader, too, and takes him under his wing. Engaged to Mary, Dan doesn't notice the growing attraction between his protégé and his intended but focuses instead on running the railroad.