Baron Gruda informs Consuelo that she will now marry Herman (Eliot Makeham), the governor of Cobra, or he will execute the island's population. Consuelo is compelled to accept, and Gruda announces the wedding date and mandatory attendance by everyone. In the meantime Vallo, Ojo, and the clever professor escape their dilemma by capsizing their skiff, trapping a large air pocket for them to breathe; walking along the sea bottom toward Cobra, they come ashore, where they quickly find out about the wedding. Vallo intends to rescue Consuelo, but the professor convinces him to first enlist the island's cooperation. Vallo agrees, and along with the professor's advanced knowledge, the people of Cobra build his advanced weapons for their coming revolt. Nitroglycerin grenades, multiple-cannon tanks, flamethrowers, rapid-fire rifles on revolving drums, and a large inflatable balloon with gondola are constructed in secret.