Description: Doug and Tony must help Marco Polo stop an attack by Mongols in thirteenth century China. Tony meets and falls in love with the daughter of Kubla Kahn. Doug and Tony are transported to 1287 and are captured by the Mongol Batu that tortures Tony trying to discover the breach in the walls of Marco Polo's fort. However, Doug manages to escape bringing Tony and is helped by Marco Polo and his men. Tony is nursed by Sarita, the daughter of Kubla Kahn, and they fall in love for each other. However Batu wants to get married with Sarita to unite Mongolia and conquer Asia and Europe. Doug and Tony help Marco Polo to produce bombs and protect the fort.