 When the Marsupilami causes chaos all over town, Spirou and Fantasio decide that it is time to take him back to his home in the Palombian jungles.After an eventful journey by cruise ship, they find that Fantasio's shady cousin Zantafio has reinvented himself as General Zantas and become the country's ruthless dictator.The now power-mad Zantafio, intent on invading a neighbouring country, offers them top positions in his army, and when they indignantly refuse throws them in jail.