It's 1865 and the telegraph is heading west. George Crane, wanting to keep law and order out of his territory, is out to stop the construction. The engineer on the job is Ken Mason and he is the grandson of Zorro. As Crane sends his men or Indians to stop the work, Mason repeatedly puts on the Zorro costume and rides to the rescue in this 12-chapter serial.

American, British and Chinese secret agents battle the Japanese Black Dragon Society, a secretive ring that smuggles enemy agents into the U.S. disguised as mummies.