United States involvement in the Mexican Revolution with its diplomatic and economic rivals in Mexico, particularly Great Britain and Germany, meant that foreign powers affected the way the Mexican situation played out. When U.S. agents discovered that the German merchant ship, the "Ypiranga", was carrying arms to Huerta's regime, President Wilson ordered troops to the port of Veracruz to stop the ship from docking. The U.S. did not declare war on Mexico city but the U.S. troops carried out a skirmish against Huerta's forces in Veracruz. The "Ypiranga" managed to dock at another port, which infuriated Wilson. On April 9, 1914, Mexican officials in the port of
The Rebel Flesh Earth in the 22nd century, which has been converted into a factory to pump acid off the island. To prevent death from the acid, the workers have utilized a "programmable matter" called the Flesh, which creates a doppelgänger (called "Ganger") controlled by the worker. As the solar storm hits, the Gangers become independent, and the Doctor, Amy and Rory must work to prevent the two groups from breaking into a war. Showrunner Steven Moffat specifically asked Graham to write the episodes about "avatars that rebel", although the Flesh and the monastery were Graham's original ideas. The episode was filmed in