Published in Jumbo Comics #14, Apr 1940 - 9 pages
ZX-5 and his fiancee, Manya Massal, are invited to fly to China to visit the Mongolian queen Yum Ling, an old friend of ZX-5. She is due to be married herself but evil Baron Orga has agents working to prevent it and have made several attempts on the life of the bridegroom, Lan, because if Yum Ling is not married by the time she reaches 20, the throne goes to someone else.