James West travels to a museum to meet Professor Johnson for a search of Montezuma's lost treasures. Unbeknownst to West, the real Professor Johnson has been replaced by a phony, who has been hired by Slade, who comes along as the head excavator. Along the way to the Aztec location, they rendezvous in a small town with Colonel Sanchez of the Mexican army. Artemus Gordon, disguised as a desert rat, who is hired as a guide. The expedition discovers an Aztec temple.
—Anonymous