King Androcles of Thebes commands a ship in search of a threat to Greece, predicted by an atmospheric oracle. Hercules is part of the crew, but the strongman falls overboard in a thick fog. Washed ashore, he saves a young Ismene from Proteus, an evil, shape-shifting creature. Ismene takes Hercules to Atlantis, where he discovers that her mother, Queen Antinea, has captured Androcles. Hercules schemes to rescue him and thwart Antinea's dream of world conquest.

Assola is an imaginary village on the border between Italy and France and the borderline crosses the village itself. The French customs agent Ferdinand is always trying to catch the Italian smuggler Giuseppe. Giuseppe discovers that Ferdinand was actually born in Italy and therefore he can't be a French customs agent.