 Upon learning that he is the son of the caliph, and impressed by his courage and determination, the thieves allow him to stay, and their leader, Old Baba (Fortunio Bonanova), adopts him as his son, Ali Baba.Ten years later, the band of thieves have become a group of Robin Hood-style resistance fighters, raiding the Mongols and giving to their poor and downtrodden people.One day, they learn of a caravan bearing the new bride for the Khan to Bagdad, which seems to be rich pickings because it is apparently only loosely guarded.