James West and Artemus Gordon help evacuate the town of Tonka Flats before it is destroyed by a cannon shell. Afterwards, they are notified that a man identified as "The Falcon" has threatened to obliterate Denver unless the U.S. government pays him $1,000,000. "The Falcon" is also in cahoots with syndicate leaders from Turkey, Spain, Prussia and England. During their investigation, Gordon is threatened by a whip-wielding Spaniard named Munez who suspects Gordon knows too much about the top secret weapon. West rescues Gordon from Munez, who is then killed by an explosive meant for the two agents. While searching Munez's body, West and Gordon find an invitation from "The Falcon". Gordon, disguised as Munez, prepares to attend the meeting while West attempts to penetrate the stronghold where the cannon is housed.